Seneca County

County

Seneca County, Ohio

Ohio · 54,522 residents (July 2025 estimate) · 13 ZIP codes · 26 cities, villages and townships

54,522 people (July 2025 estimate), -1.0% since the 2020 census; life expectancy 74.8 years; median household income $65,260 (2024). The county in numbers

Open on the map Places ZIP codes

Seneca County, Ohio

Local events in Seneca County

113 events in the next 90 days from 12 public calendars. All local events in Seneca County

Saturday, October 31

Sandusky River Trail Fun Run/Walk & Paddle

9:30 to 11 a.m. · Seneca County, see the posting for the place · From Seneca County Park District
Saturday, October 31

HS Boys/Girls Cross Country at Div. IV Regional Meet (Hedges Boyer Park)

1 to 3 p.m. · Tiffin, OH 44883, USA · From Woodmore Local School District
Sunday, November 1

Daylight Saving Time ends

All day · Seneca County, see the posting for the place · From Old Fort Local School District

Checked October 20; the events page is refreshed daily.

Seneca County in numbers

The public records that are kept county by county, in 26 blocks. Every figure names its source; a tile's small line gives the comparison or the date.

Population

How many people live here, how the count has moved since 2020 and since 1900, and how the USDA classes the county.

residents, July 2025 estimate: 54,522; Census Bureau vintage 2025

since the April 2020 census: -1.0%; from 55,080 in the Census Bureau's April 2020 estimates base

births since July 2020: 2,906

deaths since July 2020: 3,462

net migration since July 2020: +12; people who moved in, minus people who moved out

net domestic migration, 2025: -131; moved in from elsewhere in the U.S., minus moved out

net international migration, 2025: +45

Seneca County peaked at 61,901 people in 1980.

It is 1.3 times its 1900 size.

USDA rural-urban continuum code 4 of 9 (1 is the most metropolitan): nonmetro - urban population of 20,000 or more, adjacent to a metro area.

USDA ERS county typology (2015 codes): a nonmetro county with a nonspecialized economy, flagged for population loss.

Seneca County population by census year (Census Bureau)
Year	People	Source
1830	5,159	first census that counted the county
1850	27,104	decennial census
1900	41,163	decennial census
1950	52,978	decennial census
1970	60,696	decennial census
1990	59,733	decennial census
2000	58,663	Census Bureau estimates base, April 1
2010	56,745	decennial census
2020	55,080	Census Bureau estimates base, April 1
2025	54,522	July estimate

Source: Census Bureau Population Estimates Program (vintage 2025, join_popest.py); decennial counts 1900-1990 from 'Population of States and Counties of the United States 1790-1990', 2000/2010 from intercensal files; USDA ERS Rural-Urban Continuum Codes, 2023; USDA ERS county typology codes, 2015 edition · Census population estimates · USDA ERS county codes · USDA ERS county typology · About this topic

Moving in and out

People on tax returns that changed county between the returns filed in 2022 and 2023, counted by the IRS.

people moved in, 2022 to 2023: 2,215; on tax returns filed from a new county

people moved out: 1,960

net people: +255; moved in, minus moved out

people stayed put: 42,931

income that moved in: $59 million; adjusted gross income on the arrivals' 2023 returns

income that moved out: $56 million; adjusted gross income on the leavers' 2023 returns

Where arriving people came from (IRS returns, 2022 to 2023)
From	People
Hancock, OH	409
Sandusky, OH	365
Wood, OH	182

Where leaving people went (IRS returns, 2022 to 2023)
To	People
Hancock, OH	373
Sandusky, OH	245
Wood, OH	201

Source: IRS Statistics of Income county-to-county migration flows, 2022-2023 · IRS migration data · About this topic

Income and poverty

The Census Bureau's 2024 small-area estimates for the county.

of residents below the poverty line, 2024: 13.0%

of children below the poverty line, 2024: 15.6%

median household income, 2024: $65,260

Source: Census SAIPE 2024 county estimates · Census SAIPE · About this topic

Jobs and wages

Unemployment in the latest month and what employers in the county pay, from the Bureau of Labor Statistics.

unemployment rate, July 2026: 3.5%; 5.2% a year earlier

people in the labor force, July 2026: 25,799

looking for work: 894

average weekly wage, first quarter of 2026: $993; +0.6% on the year

jobs covered by unemployment insurance: 18,371; -1.0% on the year

establishments: 1,252

Largest private sectors, first quarter of 2026 (BLS QCEW)
Sector	Jobs	Average weekly wage
manufacturing	4,246	$1,314
health care and social assistance	2,258	$954
retail	2,172	$659

Source: BLS Local Area Unemployment Statistics; BLS Quarterly Census of Employment and Wages, 2026 Q1 · BLS local unemployment · BLS QCEW · About this topic

The county economy

What the county produces and earns, from the Bureau of Economic Analysis.

real GDP, 2024 (2017 dollars): $2.1 billion; +4.1% since 2019

GDP in 2024 dollars: $2.8 billion; current dollars, before adjusting for inflation

personal income per person, 2024: $52,061; 64th of Ohio's 88 counties

change in income per person since 2019: +29.8%; before inflation

Source: BEA regional accounts: county GDP (CAGDP1), per capita personal income (CAINC1), 2024 · BEA county GDP · About this topic

Businesses opening and closing

How many workplaces with employees opened and closed each year since 1978, how many people applied to start a business, and how many businesses run with no employees at all.

workplaces opened in 2023: 79; 70 closed

net workplaces, 2019 to 2023: -3; openings minus closings

applications to start a business, 2025: 471; +107% since 2019

businesses with no employees, 2023: 3,202; +9% since 2012

A workplace here is one location with paid employees: a chain with five stores is five. An application to start a business is a request for a federal employer number, not an opening, and most applicants never hire anyone.

Workplaces opened and closed, average per year
Years	Opened	Closed	Net
1978 to 1989	110	101	+9
the 1990s	93	88	+5
the 2000s	88	97	-10
the 2010s	66	78	-12
2020 to 2023	72	72	0

Workplaces opened and closed, 2019 to 2023
Year	Opened	Closed	Net
2019	62	65	-3
2020	54	75	-21
2021	84	81	+3
2022	70	61	+9
2023	79	70	+9

Source: U.S. Census Bureau: Business Dynamics Statistics 1978-2023; Business Formation Statistics, county business applications 2005-2025; Nonemployer Statistics 2012-2023 · Census Business Dynamics Statistics · Census Business Formation Statistics, counties · Census Nonemployer Statistics · About this topic

Federal money

What the federal government obligated to the county in fiscal 2025, by county of performance; Social Security, Medicare and most benefits are not counted.

in federal contracts performed in the county, fiscal 2025: $178 million; $3,228 a resident

in federal grants, fiscal 2025: $48 million; $865 a resident

in federal loans and loan guarantees: $65,860

in direct federal payments to people and organizations: $360 million

Source: USAspending federal awards by county of performance, fiscal 2025 · USAspending · About this topic

Health rankings

County Health Rankings 2025 measures for the county, with the Ohio figure alongside.

life expectancy at birth: 74.8 years; Ohio 75.2

years of life lost before 75, per 100,000 (premature death): 9,987.3; Ohio 9,740

population health group among U.S. counties: 5 of 10; 1 is healthiest

community conditions group among U.S. counties: 4 of 10; 1 is best

of children in poverty: 17.1%; Ohio 17.5%

uninsured: 6.3%; Ohio 7.1%

At least one community water system in the county had a health-based drinking water violation in the rankings' reporting year.

County Health Rankings 2025: Seneca County and Ohio
Measure	Seneca County	Ohio
Life expectancy at birth (years)	74.8	75.2
Years of potential life lost before 75, per 100,000 (premature death)	9,987.3	9,740
Adults in fair or poor health	19.8%	17.9%
Uninsured	6.3%	7.1%
Children in poverty	17.1%	17.5%
Median household income	$62,966	$67,873
Income inequality (80th to 20th percentile household income ratio)	4.1	4.6
Households with severe housing problems	9.8%	12.7%
People per primary care physician	2,745	1,328
People per mental health provider	562	286
People per dentist	2,483	1,535
Preventable hospital stays per 100,000 Medicare enrollees	2,994	3,033
Medicare enrollees with a flu vaccination	52%	51%
Injury deaths per 100,000	85.5	100.7
Suicides per 100,000	18.4	14.7
Child deaths per 100,000 (under 18)	58.0	59.2
Infant deaths per 1,000 live births	7.2	7.0
Teen births per 1,000 females 15 to 19	17.6	17.4
Average daily fine-particle pollution (PM2.5, µg/m³)	7.4	7.8
Any drinking water violation in the county	Yes
Population used by the rankings	54,527
Population health group (1 to 10 among U.S. counties; 1 is healthiest)	5
Community conditions group (1 to 10 among U.S. counties; 1 is best)	4

Source: County Health Rankings & Roadmaps 2025 (University of Wisconsin Population Health Institute) · County Health Rankings · About this topic

Cancer

New cancers and cancer deaths per 100,000 people, age-adjusted, from the National Cancer Institute's State Cancer Profiles.

new cancers a year per 100,000 people, age-adjusted, 2018 to 2022: 493.6; 95% confidence interval 470.2 to 518.0 · Ohio 472.9 · U.S. 448.6

cases a year: 362

incidence trend: stable

cancer deaths a year per 100,000, age-adjusted, 2019 to 2023: 167.6; Ohio 160.3 · U.S. 145.4

cancer deaths a year: 127

death-rate trend: falling; -0.8% a year

Cancer incidence by site, 2018 to 2022 (NCI State Cancer Profiles)
Site	Per 100,000	Ohio	Cases a year	Trend
Lung	65.1	63.6	52	stable
Colorectal	43.1	38.4	31	falling
Female breast	120.4	133.0	45	stable
Prostate	109.0	120.8	43	rising
Leukemia	17.0	13.0	11	stable
Bladder	29.7	21.8	22	stable

Source: NCI State Cancer Profiles, county incidence 2018-2022 and mortality 2019-2023 · NCI cancer profiles · About this topic

Drug overdoses

Provisional overdose death counts by county from the CDC, 12 months at a time.

overdose deaths in the 12 months ending November 2025: 10; CDC provisional count

deaths per 100,000 residents: 18.3; Ohio 20.8 in the 12 months ending December 2025

highest 12-month total since 2020: 28; 12 months ending March 2021

The county count has been suppressed (1 to 9 deaths) in every month after November 2025.

Source: CDC NCHS provisional county drug overdose deaths, 12-month-ending counts; CDC VSRR for the Ohio row · CDC overdose data · About this topic

Medicare

Who in the county is on Medicare and how they are covered, from CMS enrollment counts.

people on Medicare, 2025: 13,847; 25% of residents

aged 65 or over: 12,204

younger people with disabilities: 1,643

chose a Medicare Advantage plan: 40.6%

also on Medicaid: 15.3%

with Part D drug coverage: 86.5%

enrollment since 2020: +11.9%; 12,378 enrollees then

Source: CMS Medicare Monthly Enrollment by county, 2025 · CMS Medicare Monthly Enrollment · About this topic

Severe weather

Hail, wind, flooding and tornado reports logged for the county in NOAA's Storm Events database.

severe weather reports, 2016 to 2026: 93; NOAA Storm Events log

in reported damage: $2 million

largest hail: 3 in; March 14, 2024

strongest measured gust: 66 mph; June 10, 2020

The costliest event was damaging thunderstorm wind on November 5, 2017, $500,000 in damage. Thunderstorm downburst winds estimated to be as much as 70 mph caused considerable damage on the south side of Tiffin and also across Seneca and Eden Townships…

Severe weather reports by kind, 2016 to 2026 (NOAA Storm Events)
Kind	Reports
damaging thunderstorm wind	64
hail	21
tornadoes	3
flash floods	3

Zone-wide advisories by kind, 2016 to 2026 (NOAA Storm Events)
Kind	Reports
winter storms	4
high wind	3
extreme cold	2

Source: NOAA Storm Events database, 2016-2026 · NOAA storm events · About this topic

Weather warnings

Every warning, watch and advisory the National Weather Service has issued for the county since 2015.

tornado warnings since 2015: 14

severe thunderstorm warnings: 220

flash flood warnings: 9

winter storm or blizzard warnings: 6

warnings, watches and advisories in all: 827

National Weather Service products for Seneca County since 2015 (Iowa Environmental Mesonet archive)
Product	Count
Tornado Warning	14
Tornado Watch	14
Severe Thunderstorm Warning	220
Flash Flood Warning	9
Flood Warning	16
Areal Flood Warning	15
Areal Flood Advisory	55
Winter Storm Warning	6
Winter Weather Advisory	61
Excessive Heat Warning	2
Heat Advisory	30
Extreme Cold Warning	2
Wind Chill Warning	4
Snow Squall Warning	2

Tornado warnings by year
Year	Warnings
2015	1
2017	1
2019	1
2022	3
2023	1
2024	3
2025	2
2026	2

Source: National Weather Service warnings/watches/advisories, Iowa Environmental Mesonet VTEC archive, since 2015 · IEM warning archive · About this topic

Drought

How often the U.S. Drought Monitor has put the county in drought since 2000.

weeks in moderate drought or worse since 2020: 56

of them severe or worse: 11; most recently 7 weeks in 2025

weeks at least abnormally dry since 2020: 118

of all weeks since 2000 in drought: 8%

The worst reading since 2000 was extreme drought in October 2025.

As of September 1, 2026: no drought.

Source: U.S. Drought Monitor weekly county statistics, 2000-2026 · U.S. Drought Monitor · About this topic

The long-run climate

Average temperature and precipitation over the whole county since 1895, from NOAA's county climate series; only complete years count.

average year, 1996 to 2025: 51.1 °F; 49.4 °F in 1901 to 1930 · 49.4 °F in 1951 to 1980

change since 1901 to 1930: +1.8 °F

warmest year since 1895: 2024; 54.3 °F

precipitation in the average year, 1996 to 2025: 38.0 in; 36.6 in 1901 to 1930 (+3.7%)

wettest year since 1895: 2011; 57.7 inches

average temperature, 2025: 51.0 °F; 35.0 inches of precipitation

Source: NOAA nClimDiv county monthly temperature and precipitation, 1895-2026 (climdiv-tmpccy / climdiv-pcpncy) · NOAA climate at a glance · About this topic

Hazard mitigation

FEMA-funded projects in the county that reduce future flood, storm and other losses: buyouts, plans, studies and equipment.

hazard mitigation projects since 2004: 2; FEMA grants, program years 2004 to 2011

total project worth: $61,187; $45,890 federal

Largest: Mitigation Plan - Local Multihazard Mitigation Plan for , $34,520 (fiscal 2004).

Mitigation projects by type since 2004 (OpenFEMA)
Project type	Projects
Mitigation Plan - Local Multihazard Mitigation Plan	1
Local Multihazard Mitigation Plan	1

Source: OpenFEMA Hazard Mitigation Assistance projects, v4 API · OpenFEMA · About this topic

Air toxics

The EPA's modeled lifetime cancer risk from outdoor air toxics across the county.

lifetime cancer risk from outdoor air toxics: 20 in a million; EPA AirToxScreen 2020

Mostly formaldehyde (15.4 in a million) and carbon tetrachloride (3 in a million).

Source: EPA AirToxScreen 2020 · EPA AirToxScreen · About this topic

Water use

The 2015 figures are the U.S. Geological Survey's last county estimate, made a different way; the two are not a trend.

million gallons of fresh water withdrawn a day, 2015 (USGS estimate): 7.0

people served by public water systems, 2015: 36,300; 38 gallons a person a day used at home

people supplying their own water at home, 2015: 19,300

The U.S. Geological Survey's 2015 county estimate, which also counts small wells (million gallons a day)
Use	Million gallons a day
All uses	7.0
Public water systems	1.9
Power plants (thermoelectric)	0.0
Industry (own supply)	3.0
Irrigation	0.1
Mining	0.4
Livestock	0.2
Fish farms (aquaculture)	0.0

Source: USGS 2015 county water-use census (Dieter and others 2018) · ODNR Water Withdrawal Atlas (archived copy) · USGS county water use 2015 · About this topic

Fluoridated water

The share of county residents on community water whose water is fluoridated, from the Ohio Department of Health.

of residents on community water receive fluoridated water: 100%

Source: Ohio Department of Health county fluoridation profiles (DataOhio) · ODH fluoridation report (DataOhio) · EPA SDWIS search · About this topic

Firefighting foam (PFAS)

PFAS-based aqueous film-forming foam registered in the county with Ohio EPA, which is collecting it for disposal so it is never sprayed again.

fire departments or other holders registered: 4

of PFAS-based AFFF foam registered with Ohio EPA: 230 gal

in sealed containers: 210 gal

in opened containers: 20 gal

Source: Ohio EPA AFFF firefighting-foam inventory · Ohio EPA PFAS · About this topic

Road salt grants

H2Ohio pays for brine makers, calibrated spreaders and covered salt barns so less chloride reaches streams and wells.

H2Ohio chloride-reduction grants awarded in the county: 2

Source: Ohio EPA H2Ohio chloride reduction grants · Ohio EPA chloride reduction grants · About this topic

Farms

The county's farms in the 2022 Census of Agriculture. A dash means NASS published no figure: withheld to protect individual farms, or none reported.

farms, 2022: 1,080; 216 acres to a farm on average

acres in farms: 233,145; 209,141 acres of cropland

of the county's land is cropland: 59.1%

farm products sold, 2022: $213 million; 19% from livestock, poultry and their products

Crops and livestock, 2022 Census of Agriculture
Crop or animal	Acres or head
Corn for grain (acres harvested)	65,707
Soybeans (acres harvested)	111,329
Irrigated land (acres)	624
Cattle and calves	4,385
Hogs and pigs	59,788
Egg-laying chickens	1,424
Broilers and other meat chickens	324
Turkeys	—

Source: USDA NASS 2022 Census of Agriculture county totals (Quick Stats bulk file) · USDA Census of Agriculture · NASS 2022 county profile · About this topic

Farm pesticides

Pesticides applied on the county's farms in 2018 as estimated by the U.S. Geological Survey, in kilograms of active ingredient.

of pesticide active ingredient used on farms, 2018: 266,304 kg; USGS estimate (preliminary, high estimate)

per square mile of land: 481.4 kg; 21st of Ohio's 88 counties, most per square mile first

atrazine: 39,962 kg

glyphosate: 113,640 kg

compounds with an estimate: 144

Largest pesticides by amount applied, 2018 (USGS, kilograms)
Compound	Kilograms
glyphosate	113,640
metolachlor	48,623
atrazine	39,962
2,4-D	9,352
glufosinate	8,890

Source: USGS preliminary county agricultural pesticide-use estimates, 2018 (high estimate) · USGS county pesticide-use estimates, 2018 · About this topic

Rail accidents

Accidents railroads reported to the Federal Railroad Administration in the county since 2010. Yard mishaps at walking speed dominate; main-line derailments are the rare, dangerous ones.

rail equipment accidents since 2010: 20; FRA Form 54

derailments: 14

hazardous materials cars releasing cargo: 2

Source: FRA Form 54 rail equipment accident reports, county fallback for railAccidentLine() · FRA rail equipment accidents (Form 54) · About this topic

House records

Where the house-by-house records on this county's ZIP pages come from, and how current they are.

parcel records placed on the map: 21,644; snapshot of September 15, 2026

Seneca County Auditor, ISSG public records extract (CAMA, values, sales, tax).

Office: Seneca County Auditor (Julie A. Adkins, 109 S. Washington St, Tiffin); parcel, lot and neighborhood polygons from the same office's GIS department (ArcGIS Online org senecacountygis, every item owned by SCAuditorGIS).

These are full appraisal records: every house's year built, value and sales history opens from its ZIP page.

Source: Seneca County Auditor, ISSG public records extract (CAMA, values, sales, tax), snapshot 2026-09-15 · Seneca County Auditor (Julie A. Adkins · About this topic

What stands out

Where this county sits among Ohio's 88 on the measures the atlas tracks, and the sentences the inference engine built from them. Rankings and associations only: nothing here says one measure causes another, and a county-level pattern is not a fact about anyone who lives here.

measures flagged for this county: 4; 2 in the worst tenth of the 88

of the 85 counties with anything flagged: 58th worst; health, safety

losing ground on Ohio: 2; the gap to the state is widening

peer group the engine compares it against: small metro and micropolitan

"Losing ground on Ohio" compares trends, not levels: a county can be losing ground while its own number improves, if the rest of the state improved faster over the same years.

Across Ohio, share of adults with coronary heart disease and total adjusted gross income per resident move in opposite directions. Seneca County is an exception: its total adjusted gross income per resident is $29,290 (2022), far lower than the statewide pattern predicts from its share of adults with coronary heart disease of 5.9% (2025). Sources: CDC; IRS Statistics of Income.

Seneca County has Ohio's highest private-sector jobs in unclassified industries per 10,000 residents: 2.0 (2023). Source: U.S. Bureau of Labor Statistics.

Across Ohio, share of adults with chronic kidney disease and government transfer receipts per resident move together. Seneca County is an exception: its government transfer receipts per resident is $15,856 (2024), far higher than the statewide pattern predicts from its share of adults with chronic kidney disease of 3.3% (2023). Sources: CDC; U.S. Bureau of Economic Analysis.

Across Ohio, share of adults with diagnosed diabetes and government transfer receipts per resident move together. Seneca County is an exception: its government transfer receipts per resident is $15,856 (2024), far higher than the statewide pattern predicts from its share of adults with diagnosed diabetes of 13.2% (2025). Sources: CDC; U.S. Bureau of Economic Analysis.

Seneca County's violent crime rate rose from 50.3 per 100,000 in 2013 to 171.9 per 100,000 in 2019, a change of +242%, the 4th steepest rise among the 85 Ohio counties with the data. Source: University of Wisconsin Population Health Institute / RWJF.

Seneca County's population peaked at 61,901 in 1980; it was 54,730 in 2024, 12% below that peak. Source: U.S. Census Bureau.

Across Ohio, share of adults with coronary heart disease and votes cast for U.S. Senate per 10,000 residents move in opposite directions. Seneca County is an exception: its votes cast for U.S. Senate per 10,000 residents is 4,584.3 (2024), far lower than the statewide pattern predicts from its share of adults with coronary heart disease of 5.9% (2025). Sources: CDC; OpenElections.

Seneca County's home-purchase mortgage denial rate fell from 13.9% in 2018 to 8.0% in 2023, a change of -43%, the 3rd steepest fall among the 88 Ohio counties with the data. Source: FFIEC/CFPB.

Measures where Seneca County stands out, worst first
Measure	Latest	Ohio median	Rank, worst first	Change
Traffic fatalities per 10,000 residents	2.4 per 10,000 residents (2024)	1.1	10th of 88	2.4 from 2.5 since 2013 · losing ground on Ohio
Violent crime rate (County Health Rankings)	171.9 per 100,000 (2019)	114.8	22nd of 84	171.9 from 50.3 since 2013 · losing ground on Ohio
Share of adults with obesity (County Health Rankings)	47.1% (2025)	41.2%	2nd of 88
Share of adults who binge drink	19.7% (2025)	18.3%	8th of 88

Source: Cracked Buckeye inference engine (scripts/inference) over the county-year panel, run 2026-09-21 · What moves with what across Ohio

Places

The 26 cities, villages and townships whose residents live mostly in Seneca County, with the population of each.

Cities 2

Villages 6

Townships 18

ZIP codes

The 13 ZIP codes whose residents live mostly in Seneca County, largest first. Each links to its own page; the water system column links to the utility serving most of its residents.

ZIP codes of Seneca County: residents (2020 census), the water system serving most residents, radon, home value, school district and flood exposure
ZIP	Name	Residents	Water system	Radon	Home value	School district	Flood
44883	Tiffin	28,690	Aqua Ohio - Tiffin 64% Inland rivers	6.9 pCi/L average radon	Median home $163,600	Tiffin City 3.5 stars overall	5.6% of residents in the 1% floodplain
44830	Fostoria	18,442	Fostoria City 72% Inland rivers	4.0 pCi/L average radon	Median home $121,700	Fostoria City 2.5 stars overall	0.6% of residents in the 1% floodplain
44836	Green Springs	2,538	Green Springs Village 49% Mostly private wells	4.5 pCi/L average radon	Median home $139,500	Clyde-Green Springs Exempted Village 4 stars overall	2.1% of residents in the 1% floodplain
44818	Bloomville	2,399	Bloomville Village 36% Mostly private wells	10.1 pCi/L average radon	Median home $141,300	Buckeye Central Local 4 stars overall	2.0% of residents in the 1% floodplain
44867	Scipio Township and Republic	2,280	Republic Village 22% Mostly private wells	3.3 pCi/L average radon	Median home $167,000	Seneca East Local 4.5 stars overall	1.3% of residents in the 1% floodplain
44807	Attica	2,264	Attica Village 44% Mostly private wells	1.2 pCi/L average radon	Median home $153,200	Seneca East Local 4.5 stars overall	2.0% of residents in the 1% floodplain
44853	Seneca Township and New Riegel	1,447	no mapped system	1.3 pCi/L average radon	Median home $156,100	New Riegel Local 4.5 stars overall	0.0% of residents in the 1% floodplain
44802	Big Spring Township and Alvada	948	no mapped system	6.3 pCi/L average radon	Median home $197,100	New Riegel Local 4.5 stars overall	0.0% of residents in the 1% floodplain
44841	Liberty Township and Kansas	821	no mapped system	Too few radon tests	Home value not published	Lakota Local 3.5 stars overall	11% of residents in the 1% floodplain
44815	Bettsville	679	Bettsville Village 74% Groundwater (wells)	Too few radon tests	Median home $112,800	Old Fort Local 4 stars overall	10% of residents in the 1% floodplain
44809	Hopewell Township and Bascom	287	no mapped system	Too few radon tests	Median home $140,600	Hopewell-Loudon Local 4 stars overall	0.0% of residents in the 1% floodplain
44828	Thompson Township and Flat Rock	186	no mapped system	Too few radon tests	No Census data	Bellevue City 4 stars overall	0.0% of residents in the 1% floodplain
44861	Pleasant Township and Old Fort	112	no mapped system	Too few radon tests	No Census data	Old Fort Local 4 stars overall	9.8% of residents in the 1% floodplain

Source: residents: 2020 Census (POP100, ZCTA) · water systems: EPA SDWIS + service-area-boundary join · radon: Ohio Department of Health radon test results by ZIP since 2010 · home value: Census ACS 2020-2024 5-year by ZCTA (housing/commute tables) · school districts: Ohio school district boundaries (OGRIP via ODOT) · flood: FEMA National Flood Hazard Layer.

On the map

Open the map fitted to Seneca County. Every ZIP code in the table above links to its page, and each page opens the map at that ZIP.

Historic places: 35 National Register listings in Seneca County. See every one on the map, each with its record and its National Park Service file.

Rankings within the county

The county's ZIP codes ranked by what the map measures; each heading links to the topic's page.

Highest radon

44818Bloomville10.1 pCi/L
44883Tiffin6.9 pCi/L
44802Big Spring Township and Alvada6.3 pCi/L
44836Green Springs4.5 pCi/L
44830Fostoria4.0 pCi/L

Most snow

44828Thompson Township and Flat Rock32.7 in a year
44883Tiffin29.5 in a year
44867Scipio Township and Republic29.5 in a year
44853Seneca Township and New Riegel29.5 in a year
44830Fostoria29.5 in a year

Oldest homes

44861Pleasant Township and Old Fortmedian year built 1896
44807Atticamedian year built 1915
44809Hopewell Township and Bascommedian year built 1920
44818Bloomvillemedian year built 1920
44828Thompson Township and Flat Rockmedian year built 1920

Highest home values

44802Big Spring Township and Alvada$197,100
44867Scipio Township and Republic$167,000
44883Tiffin$163,600
44853Seneca Township and New Riegel$156,100
44807Attica$153,200

Best school stars

44867Scipio Township and Republic4.5 stars
44853Seneca Township and New Riegel4.5 stars
44807Attica4.5 stars
44802Big Spring Township and Alvada4.5 stars
44861Pleasant Township and Old Fort4.0 stars

Local government

Who holds office in Seneca County, how its elections and ballot issues came out, and the state auditor's record.

Turnout

Election	Registered	Ballots cast	Turnout
2025-05-06 primary	35,207	3,079	8.7%
2024-11-05 general	35,069	25,651	73.1%
2024-03-19 primary	34,425	8,441	24.5%
2023-05-02 primary	33,949	5,280	15.6%
2020-11-03 general	34,413	26,068	75.8%

Who holds office

Office	Name	Term ends	Contact
Commissioner	Anthony Paradiso	2029-01-01	(419) 447-4550 ext. 6504 · aparadiso@senecacountyohio.gov 111 Madison Street, Tiffin, OH 44883 · website
Commissioner	Bill Frankart	2026-12-31	(419) 447-4550 ext. 6505 · bfrankart@senecacountyohio.gov 111 Madison Street, Tiffin, OH 44883 · website
Commissioner	Brent Busdeker	2029-01-02	(419) 447-4550 ext. 6506 · bbusdeker@senecacountyohio.gov 111 Madison Street, Tiffin, OH 44883 · website
Clerk of Courts	Stephanie Hicks	2028-12-31	419-447-0671 103 East Market Street, Tiffin, OH 44883, Legal Department, Suite 101
Auditor	Julie A. Adkins	2027-03-07	419-447-0692 · auditorinfo@senecacountyohio.gov 109 S Washington Street, Tiffin, Ohio 44883, Suite 2206
Recorder	Michael Dell	2028-12-31	419-447-4434 109 S Washington Street, Tiffin, Ohio 44883, Suite 2104
Treasurer	Annette M. Everhart	2029-09-02	419-447-1584 · aeverhart@senecacountyohio.gov 109 S Washington Street, Tiffin, Ohio 44883, Suite 2105 · website
Coroner	Dr. Zachary West	2028-12-31	419-447-8053 ext. 1101 & 1102 · zwest@senecacountyohio.gov 109 S Washington Street, Tiffin, Ohio 44883, Suite 1001
Prosecuting Attorney	Derek DeVine	2028-12-31	419-448-4444 79 S Washington Street, Tiffin, Ohio 44883
Engineer	Mark Zimmerman	2028-12-31	419-447-1011 · mzimmerman@senecacountyohio.gov 3300 S TR 151, Tiffin, Ohio 44883
Sheriff	Fred Stevens	2028-12-31	419-447-3456 · sheriff@senecacountyohio.gov 3040 S SR 100, Tiffin, Ohio 44883

Roster as of 2025-10-10: county board of elections.

Elections for office

Date	Office	Candidates and votes
2024-11-05	Treasurer	Annette M. Everhart (REP) 20,369, 100.0%
2024-11-05	Sheriff	Fredrick W. Stevens (REP) 20,872, 100.0%
2024-11-05	Recorder	Michael J. Dell (REP) 20,624, 100.0%
2024-11-05	Prosecuting Attorney	Derek W. DeVine 19,748, 100.0%
2024-11-05	Engineer	Mark R. Zimmerman (REP) 20,603, 100.0%
2024-11-05	Coroner	Zachary West (REP) 20,285, 100.0%
2024-11-05	Commissioner	Anthony J. Paradiso (REP) 20,764, 100.0%
2024-11-05	Commissioner	Brent David Busdeker (REP) 20,077, 100.0%
2024-11-05	Clerk of Courts	Stephanie C. Hicks (REP) 20,319, 100.0%
2024-03-19	Treasurer	Annette M. Everhart 3,393, 56.78%; Vicki Wickham 2,583, 43.22%
2024-03-19	Sheriff	Fredrick W. Stevens 5,658, 100.0%
2024-03-19	Recorder	Michael J. Dell 5,583, 100.0%
2024-03-19	Member, County Central Committee (Tiffin 4-D) (DEM primary)	Amanda Baker 29, 100.0%
2024-03-19	Member, County Central Committee (Tiffin 4-C) (DEM primary)	William Reyer 25, 100.0%
2024-03-19	Member, County Central Committee (Tiffin 4-A) (DEM primary)	Gina R. Grandillo 34, 100.0%
2024-03-19	Member, County Central Committee (Tiffin 3-D) (DEM primary)	Lori M. Elchert 23, 100.0%
2024-03-19	Member, County Central Committee (Tiffin 2-C) (DEM primary)	Gail M. Roberts 50, 100.0%
2024-03-19	Member, County Central Committee (Tiffin 2-B) (DEM primary)	Susan Wilkinson 17, 100.0%
2024-03-19	Member, County Central Committee (Tiffin 1-C) (DEM primary)	John Bing 40, 100.0%
2024-03-19	Member, County Central Committee (Tiffin 1-B) (DEM primary)	Thomas Shuman 47, 100.0%
2024-03-19	Member, County Central Committee (Seneca B) (DEM primary)	Casey Losey 9, 100.0%
2024-03-19	Member, County Central Committee (Pleasant Township) (DEM primary)	Maribeth Becker 29, 100.0%
2024-03-19	Member, County Central Committee (Clinton C) (DEM primary)	Pamela S. Easterday 34, 100.0%
2024-03-19	Engineer	Mark R. Zimmerman 5,604, 100.0%
2024-03-19	Coroner	Zachary West 3,266, 51.38%; Mark Akers 3,091, 48.62%

Winners in bold. Results from the county board of elections' official canvass unless marked.

Auditor of State record

No fiscal caution, watch or emergency on the Auditor of State's lists.
Financial Health Indicators (the Auditor of State's 17 measures; critical / cautionary / positive): 2020 0 / 0 / 17; 2021 0 / 1 / 16; 2022 0 / 1 / 16; 2023 0 / 1 / 16; 2024 0 / 2 / 15; 2025 0 / 1 / 15.
Public Interest Report, 2023, released 2025-11-06
Financial Audit, 2024, released 2025-09-23
Financial Audit, 2023, released 2024-09-26

Townships and villages without a page of their own

Thompson Township: 2 of 2 money issues passed since 2024

Money issues on the ballot since 2024: 2 of 2 passed.

Ballot issues

Date	Issue	For	Against	Result
2024-11-05	Issue: Thompson Township Tax Levy Ambulance and Medical	399	254	Passed (61.1% for)
2024-11-05	Issue: Thompson Township Tax Levy Fire	440	211	Passed (67.59% for)

Auditor of State record

No fiscal caution, watch or emergency on the Auditor of State's lists.
Agreed Upon Procedures, 2023 to 2024, released 2025-09-04

School districts

Arcadia Local School District: 0 of 2 money issues passed since 2024

Money issues on the ballot since 2024: 0 of 2 passed.

Ballot issues

Date	Issue	For	Against	Result
2024-03-19	Issue: Arcadia Local School District Renewal	0	2	Failed
2024-03-19	Issue: Arcadia Local School District Income Tax	1	1	Failed (50.0% for)

Bellevue City School District: 0 of 2 money issues passed since 2024

Money issues on the ballot since 2024: 0 of 2 passed.

Ballot issues

Date	Issue	For	Against	Result
2025-05-06	Issue: Bellevue City School Income Tax Renewal	58	76	Failed (43.28% for)
2024-11-05	Issue: Bellevue CSD Income Tax	294	430	Failed (40.61% for)

Clyde-Green Springs Exempted Village School District: 0 of 1 money issues passed since 2024

Money issues on the ballot since 2024: 0 of 1 passed.

Ballot issues

Date	Issue	For	Against	Result
2024-03-19	Issue: Clyde-Green Springs EVSD Tax Levy	137	208	Failed (39.71% for)

EHOVE Joint Vocational School District: 0 of 1 money issues passed since 2024

Money issues on the ballot since 2024: 0 of 1 passed; of those asking for new or higher taxes, 0 of 1.

Ballot issues

Date	Issue	For	Against	Result
2024-11-05	Issue: EHOVE JVSD Bond Issue	280	432	Failed (39.33% for)

Fostoria City School District

Auditor of State record

No fiscal caution, watch or emergency on the Auditor of State's lists.
Financial Audit, 2024 to 2025, released 2026-02-17
Financial Audit, 2023 to 2024, released 2025-07-08

Hopewell Loudon Local School District: 1 of 2 money issues passed since 2024

Money issues on the ballot since 2024: 1 of 2 passed.

Ballot issues

Date	Issue	For	Against	Result
2024-11-05	Issue: Hopewell Loudon LSD Tax Levy Emergency	1,310	1,057	Passed (55.34% for)
2024-03-19	Issue: Hopewell Loudon Local School District Tax Levy	379	542	Failed (41.15% for)

Auditor of State record

No fiscal caution, watch or emergency on the Auditor of State's lists.
Financial Audit, 2023 to 2025, released 2026-04-09

Mohawk Local School District: 1 of 1 money issues passed since 2024

Money issues on the ballot since 2024: 1 of 1 passed.

Ballot issues

Date	Issue	For	Against	Result
2024-11-05	Issue: Mohawk LSD Income Tax	875	785	Passed (52.71% for)

New Riegel Local School District: 1 of 1 money issues passed since 2020

Money issues on the ballot since 2020: 1 of 1 passed.

Ballot issues

Date	Issue	For	Against	Result
2020-11-03	Issue: New Riegel LSD Income Tax Renewal	664	414	Passed (61.6% for)

Auditor of State record

No fiscal caution, watch or emergency on the Auditor of State's lists.
Financial Audit, 2022 to 2024, released 2025-03-25

Old Fort Local School District

Auditor of State record

No fiscal caution, watch or emergency on the Auditor of State's lists.
Financial Audit, 2024 to 2025, released 2026-02-24
Financial Audit, 2023 to 2024, released 2025-03-13

Seneca East Local School District: 1 of 1 money issues passed since 2024

Money issues on the ballot since 2024: 1 of 1 passed.

Ballot issues

Date	Issue	For	Against	Result
2024-11-05	Issue: Seneca East LSD Income Tax	1,306	1,045	Passed (55.55% for)

Seneca-East Local School District

Auditor of State record

No fiscal caution, watch or emergency on the Auditor of State's lists.
Financial Audit, 2024 to 2025, released 2026-04-09
Financial Audit, 2023 to 2024, released 2025-02-04

Tiffin City School District

Auditor of State record

No fiscal caution, watch or emergency on the Auditor of State's lists.
Financial Audit, 2024 to 2025, released 2026-03-26
Financial Audit, 2023 to 2024, released 2025-03-27

Courts, districts and other bodies

Birchard Public Library: 1 of 1 money issues passed since 2020

Money issues on the ballot since 2020: 1 of 1 passed.

Ballot issues

Date	Issue	For	Against	Result
2020-11-03	Issue: Birchard Pub Libr Tax Levy Renewal	393	185	Passed (67.99% for)

Findlay-Hancock County Public Library: 0 of 1 money issues passed since 2025

Money issues on the ballot since 2025: 0 of 1 passed.

Ballot issues

Date	Issue	For	Against	Result
2025-05-06	Issue: Findlay-Hancock County Public Library Levy Renewal	1	2	Failed (33.33% for)

Mohawk Community Library: 2 of 2 money issues passed since 2020

Money issues on the ballot since 2020: 2 of 2 passed.

Ballot issues

Date	Issue	For	Against	Result
2024-11-05	Issue: Mohawk Community Library Tax Levy Operating Expenses	904	733	Passed (55.22% for)
2020-11-03	Issue: Mohawk Community Library Tax Renewal	961	683	Passed (58.45% for)

Seneca County Court of Common Pleas

Who holds office

Office	Name	Party	Term ends	Contact
Judge	Damon Alt		2028-12-31	419-447-2982 103 East Market Street, Tiffin, OH 44883, Common Pleas Ct. I, Suite 401
Judge	Steve Shuff		2029-01-01	419-448-1302 103 East Market Street, Tiffin, OH 44883, Common Pleas Ct. II, Suite 301

Roster as of 2025-10-10: county board of elections.

Elections for office

Date	Office	Candidates and votes
2020-11-03	Judge	Jay A. Meyer 20,938, 100.0%

Winners in bold. Results from the county board of elections' official canvass unless marked.

Seneca County General Health District: 1 of 1 money issues passed since 2020

Money issues on the ballot since 2020: 1 of 1 passed; of those asking for new or higher taxes, 1 of 1.

Ballot issues

Date	Issue	For	Against	Result
2020-11-03	Issue: Seneca Cnty GenHealthDist Replace Levy	13,789	11,124	Passed (55.35% for)

Seneca County Juvenile Court

Who holds office

Office	Name	Party	Term ends	Contact
Judge	Jay Meyer		2027-02-08	419-447-4912 103 East Market Street, Tiffin, OH 44883, Suite 5101

Roster as of 2025-10-10: county board of elections.

Seneca County Probate Court

Who holds office

Office	Name	Party	Term ends	Contact
Judge	Jay Meyer		2027-02-08	419-447-3121 103 East Market Street, Tiffin, OH 44883, Suite 5102

Roster as of 2025-10-10: county board of elections.

Seneca East Public Library: 1 of 1 money issues passed since 2020

Money issues on the ballot since 2020: 1 of 1 passed; of those asking for new or higher taxes, 1 of 1.

Ballot issues

Date	Issue	For	Against	Result
2020-11-03	Issue: Seneca East Pub Libr Tax Levy Replace	1,580	1,004	Passed (61.15% for)

Third District Court of Appeals

Elections for office

Date	Office	Candidates and votes
2024-11-05	Judge (this county's part)	John R. Willamowski (REP) 20,523, 100.0%
2024-03-19	Judge (this county's part)	John R. Willamowski 5,240, 100.0%
2020-11-03	Judge (this county's part)	Mark C. Miller 19,399, 100.0%

Winners in bold. Results from the county board of elections' official canvass unless marked.

Tiffin Municipal Court

Who holds office

Office	Name	Party	Term ends	Contact
Judge	Rhonda Best		2025-12-31	419-448-5418 103 East Market Street, Tiffin, OH 44883, Suite 201

Roster as of 2025-10-10: county board of elections.

Elections for office

Date	Office	Candidates and votes
2023-05-02	Judge	Rhonda L. Best 3,570, 73.91%; Mark E. Repp 1,260, 26.09%

Winners in bold. Results from the county board of elections' official canvass unless marked.

How Seneca County began

Seneca County was created by the Ohio legislature in 1820 out of formerly Native-held land and formally organized on April 1, 1824, taking its name from the Seneca people whose reservation on the Sandusky River occupied a large share of the county until 1831. Its seat, Tiffin, grew from two rival War of 1812 settlements, Fort Ball and Fort Seneca, and was platted in 1822 by Josiah Hedges, who named it for Ohio's first governor, Edward Tiffin. The county was heavily forested farmland through the 19th century, filled out by New England and New York migrants after the Erie Canal and by a wave of about 900 Luxembourger immigrants around 1889; it later became a modest manufacturing and glass-making center on the strength of natural gas discovered in 1888. Seneca County today remains a rural and small-manufacturing county anchored by Tiffin, Fostoria and Bellevue, with a population that peaked around 1980 and has slowly declined since.

Researched 2026-09-25 · en.wikipedia.org · en.wikipedia.org · wgpfoundation.org · en.wikipedia.org. The full history, with photographs, is on the pages of the county's places.

Politics

How Seneca County has voted for president since 1852, turnout since 1996, and what is on its 2026 ballot.

Presidential election results by margin, SenecaSeneca's presidential margin has run from 1852 to 2024; bar height is the winning margin, color the winning party.Source: Wikipedia · as of 2026-09-18 · Download this chart

The numbers behind this figure, as a table

Presidential election results by margin, Seneca
Year	Winner	Party	Margin	Matched Ohio's winner	Matched the nation
1852	Franklin Pierce	D	17.1 points	matched	matched
1856	James Buchanan	D	0.8 points	missed	matched
1860	Stephen A. Douglas	D	1.9 points	missed	missed
1864	George B. McClellan	D	3.8 points	missed	missed
1868	Horatio Seymour	D	8.6 points	missed	missed
1872	Horace Greeley	LR	5.0 points	missed	missed
1876	Samuel J. Tilden	D	8.7 points	missed	missed
1880	Winfield Scott Hancock	D	9.3 points	missed	missed
1884	Grover Cleveland	D	10.3 points	missed	matched
1888	Grover Cleveland	D	11.0 points	missed	missed
1892	Grover Cleveland	D	11.7 points	missed	matched
1896	William Jennings Bryan	D	11.9 points	missed	missed
1900	William Jennings Bryan	D	9.4 points	missed	missed
1904	Theodore Roosevelt	R	5.1 points	matched	matched
1908	William Jennings Bryan	D	10.2 points	missed	missed
1912	Woodrow Wilson	D	26.6 points	matched	matched
1916	Woodrow Wilson	D	19.3 points	matched	matched
1920	Warren G. Harding	R	10.2 points	matched	matched
1924	Calvin Coolidge	R	18.5 points	matched	matched
1928	Herbert Hoover	R	24.2 points	matched	matched
1932	Franklin D. Roosevelt	D	13.6 points	matched	matched
1936	Alf Landon	R	4.4 points	missed	missed
1940	Wendell Willkie	R	37.1 points	missed	missed
1944	Thomas E. Dewey	R	41.7 points	matched	missed
1948	Thomas E. Dewey	R	18.1 points	missed	missed
1952	Dwight D. Eisenhower	R	43.1 points	matched	matched
1956	Dwight D. Eisenhower	R	47.8 points	matched	matched
1960	Richard Nixon	R	22.4 points	matched	missed
1964	Lyndon B. Johnson	D	20.7 points	matched	matched
1968	Richard Nixon	R	13.3 points	matched	matched
1972	Richard Nixon	R	25.1 points	matched	matched
1976	Gerald Ford	R	7.4 points	missed	missed
1980	Ronald Reagan	R	29.5 points	matched	matched
1984	Ronald Reagan	R	35.0 points	matched	matched
1988	George H.W. Bush	R	17.9 points	matched	matched
1992	George H.W. Bush	R	1.8 points	missed	missed
1996	Bill Clinton	D	1.4 points	matched	matched
2000	George W. Bush	R	17.9 points	matched	matched
2004	George W. Bush	R	18.2 points	matched	matched
2008	John McCain	R	2.7 points	missed	missed
2012	Mitt Romney	R	7.5 points	missed	missed
2016	Donald Trump	R	30.9 points	matched	matched
2020	Donald J Trump	R	34.2 points	matched	missed
2024	Donald J Trump	R	37.5 points	matched	matched

Every presidential election in Seneca County, year by year: its record with Ohio and the nation, closest and widest results, biggest swings, and where it has ranked among the 88.

Voter turnout in Seneca County, 1996-2024
Year	Registered	Ballots cast	Turnout
1996	34,189	24,213	70.82%
2000	35,917	24,931	69.41%
2004	37,974	27,607	72.7%
2008	36,440	27,885	76.52%
2012	36,320	25,609	70.51%
2016	34,399	24,568	71.42%
2020	34,413	26,068	75.75%
2024	35,068	25,651	73.15%

On the 2026 ballot in Seneca County:

Local questions and issues on Seneca County's November 2026 ballot
Jurisdiction	Type	Question	Millage or amount	Length
Mental Health Recovery Services County	Tax Levy (Renewal)	Renews a 0.7-mill property tax levy to operate alcohol, drug addiction & mental health facilities of Mental Health Recovery Services County for 10 years, beginning in 2027.	0.7 mills	10 years
Bettsville Public Library School District	Tax Levy (Renewal)	Renews a 0.4-mill property tax levy for the current expenses of Bettsville Public Library School District for 5 years, beginning in 2027.	0.4 mills	5 years
Old Fort Local School District	Tax Levy (Renewal)	Renews a 6.3-mill property tax levy for the operating expenses & general permanent improvements of Old Fort Local School District for 5 years, beginning in 2027.	6.3 mills	5 years
Bettsville Village - The Quarry Campground Precinct	Liquor Option	Local liquor option on Sunday sales, in Bettsville Village - The Quarry Campground Precinct.	—	—
Fostoria City	Tax Levy (Renewal)	Renews a 6-mill property tax levy for the current expenses of Fostoria City for 5 years, beginning in 2027.	6 mills	5 years

What's on my ballot · Election 2026

Sources for the presidential results and turnout above

Data from Wikipedia, CC BY-SA 4.0:

Ohio Secretary of State: oh_1984_general_president_county.xlsx -- Ohio Secretary of State Past Election Results portal
MIT Election Data and Science Lab (MEDSL), Harvard Dataverse: County Presidential Election Returns 2000-2024 (V20)

All 44 presidential elections 1852-2024 present. Turnout 1996-2024 per the ruling's storage section (county-level turnout before 1996 is confirmed absent from the OH SOS portal per A/sources/CITATIONS.md; not this task's scope to invent from elsewhere).

Where Seneca County sits

Three measures this atlas holds, set against how all 88 counties voted for president. Seneca County is the marked dot on each.

This is a pattern across counties, not a fact about any voter.

White-alone share and the presidential voteAcross Ohio's 88 counties the 2024 Republican presidential margin runs higher where a larger share of residents is white alone (Spearman rho 0.82; partial rho 0.56 with log population held fixed; 0.81 without Cuyahoga and Franklin; n = 88).Source: U.S. Census Bureau · as of 2026-09 · Download this chart

The numbers behind this figure, as a table

White-alone share and the presidential vote
County	Share white alone, 2024	Presidential margin, 2024 (R minus D, points)
Adams	96.4%	R+66.1
Allen	80.0%	R+44.5
Ashland	94.7%	R+50.4
Ashtabula	88.6%	R+28.6
Athens	89.7%	D+10.8
Auglaize	94.6%	R+65.1
Belmont	90.9%	R+47.6
Brown	95.2%	R+61.8
Butler	75.8%	R+26.5
Carroll	94.6%	R+55.2
Champaign	92.0%	R+51.2
Clark	82.4%	R+29.8
Clermont	91.6%	R+36.1
Clinton	92.1%	R+55.1
Columbiana	92.6%	R+49.4
Coshocton	94.7%	R+52.6
Crawford	95.1%	R+53.4
Cuyahoga	57.7%	D+31.7
Darke	95.1%	R+65.8
Defiance	86.7%	R+40.2
Delaware	79.9%	R+6.7
Erie	80.8%	R+14.3
Fairfield	81.5%	R+24.3
Fayette	91.2%	R+55.6
Franklin	59.0%	D+28.7
Fulton	89.2%	R+42.8
Gallia	92.9%	R+59.8
Geauga	93.2%	R+24.3
Greene	82.0%	R+20.0
Guernsey	93.8%	R+52.4
Hamilton	63.2%	D+15.0
Hancock	88.7%	R+38.9
Hardin	93.0%	R+55.2
Harrison	94.3%	R+55.7
Henry	90.4%	R+47.1
Highland	95.2%	R+63.7
Hocking	94.9%	R+44.6
Holmes	97.9%	R+69.7
Huron	91.7%	R+44.4
Jackson	95.7%	R+58.4
Jefferson	89.4%	R+44.4
Knox	93.6%	R+45.3
Lake	85.5%	R+14.5
Lawrence	94.0%	R+50.9
Licking	85.7%	R+30.3
Logan	91.9%	R+56.7
Lorain	78.0%	R+5.8
Lucas	68.2%	D+12.7
Madison	86.7%	R+44.1
Mahoning	74.9%	R+9.5
Marion	87.0%	R+41.7
Medina	92.0%	R+25.0
Meigs	96.2%	R+57.4
Mercer	94.9%	R+67.2
Miami	90.4%	R+45.5
Monroe	95.3%	R+60.3
Montgomery	68.4%	D+0.5
Morgan	90.5%	R+53.6
Morrow	94.0%	R+56.2
Muskingum	90.8%	R+44.3
Noble	92.2%	R+65.1
Ottawa	92.0%	R+25.3
Paulding	90.8%	R+56.8
Perry	95.8%	R+54.9
Pickaway	91.1%	R+49.0
Pike	94.9%	R+54.0
Portage	86.5%	R+15.7
Preble	95.5%	R+59.6
Putnam	92.1%	R+69.4
Richland	84.6%	R+42.7
Ross	88.7%	R+39.7
Sandusky	84.4%	R+31.1
Scioto	92.9%	R+48.2
Seneca	89.6%	R+37.9
Shelby	92.0%	R+65.3
Stark	84.5%	R+22.1
Summit	74.0%	D+7.0
Trumbull	85.2%	R+16.9
Tuscarawas	93.5%	R+43.6
Union	85.2%	R+29.9
Van Wert	93.0%	R+59.0
Vinton	96.0%	R+59.0
Warren	82.7%	R+31.8
Washington	93.9%	R+44.1
Wayne	93.3%	R+39.6
Williams	91.7%	R+48.7
Wood	87.1%	R+10.3
Wyandot	94.6%	R+51.6

Seneca County sits higher than 33 of the 88 counties measured on share white alone. White-alone share and the presidential vote

Bachelor's-degree share and the presidential voteAcross Ohio's 88 counties the 2024 Republican presidential margin runs lower where a larger share of adults holds a bachelor's degree (Spearman rho -0.72; partial rho -0.29 with log population held fixed; -0.70 without Cuyahoga and Franklin; n = 88).Source: U.S. Census Bureau · as of 2026-09 · Download this chart

The numbers behind this figure, as a table

Bachelor's-degree share and the presidential vote
County	Share 25+ with a bachelor's degree or higher, 2024	Presidential margin, 2024 (R minus D, points)
Adams	14.9%	R+66.1
Allen	20.1%	R+44.5
Ashland	22.6%	R+50.4
Ashtabula	16.1%	R+28.6
Athens	34.9%	D+10.8
Auglaize	21.6%	R+65.1
Belmont	18.9%	R+47.6
Brown	15.7%	R+61.8
Butler	32.8%	R+26.5
Carroll	16.1%	R+55.2
Champaign	19.0%	R+51.2
Clark	20.2%	R+29.8
Clermont	31.6%	R+36.1
Clinton	19.3%	R+55.1
Columbiana	17.1%	R+49.4
Coshocton	16.7%	R+52.6
Crawford	17.2%	R+53.4
Cuyahoga	36.5%	D+31.7
Darke	16.5%	R+65.8
Defiance	19.0%	R+40.2
Delaware	59.4%	R+6.7
Erie	29.0%	R+14.3
Fairfield	32.3%	R+24.3
Fayette	14.4%	R+55.6
Franklin	42.1%	D+28.7
Fulton	20.2%	R+42.8
Gallia	20.5%	R+59.8
Geauga	40.9%	R+24.3
Greene	41.7%	R+20.0
Guernsey	15.6%	R+52.4
Hamilton	41.8%	D+15.0
Hancock	30.3%	R+38.9
Hardin	19.5%	R+55.2
Harrison	11.5%	R+55.7
Henry	19.5%	R+47.1
Highland	16.3%	R+63.7
Hocking	13.5%	R+44.6
Holmes	11.1%	R+69.7
Huron	16.7%	R+44.4
Jackson	15.9%	R+58.4
Jefferson	20.3%	R+44.4
Knox	24.7%	R+45.3
Lake	31.6%	R+14.5
Lawrence	18.5%	R+50.9
Licking	29.3%	R+30.3
Logan	18.7%	R+56.7
Lorain	28.5%	R+5.8
Lucas	29.4%	D+12.7
Madison	24.2%	R+44.1
Mahoning	27.0%	R+9.5
Marion	14.7%	R+41.7
Medina	36.2%	R+25.0
Meigs	12.2%	R+57.4
Mercer	21.9%	R+67.2
Miami	26.8%	R+45.5
Monroe	12.1%	R+60.3
Montgomery	31.3%	D+0.5
Morgan	14.4%	R+53.6
Morrow	19.4%	R+56.2
Muskingum	20.6%	R+44.3
Noble	15.7%	R+65.1
Ottawa	29.5%	R+25.3
Paulding	16.9%	R+56.8
Perry	16.2%	R+54.9
Pickaway	21.7%	R+49.0
Pike	16.3%	R+54.0
Portage	32.5%	R+15.7
Preble	18.5%	R+59.6
Putnam	26.4%	R+69.4
Richland	17.9%	R+42.7
Ross	17.4%	R+39.7
Sandusky	18.4%	R+31.1
Scioto	18.2%	R+48.2
Seneca	20.6%	R+37.9
Shelby	21.4%	R+65.3
Stark	25.9%	R+22.1
Summit	35.8%	D+7.0
Trumbull	20.9%	R+16.9
Tuscarawas	19.8%	R+43.6
Union	39.2%	R+29.9
Van Wert	17.1%	R+59.0
Vinton	13.4%	R+59.0
Warren	45.6%	R+31.8
Washington	21.9%	R+44.1
Wayne	25.1%	R+39.6
Williams	13.7%	R+48.7
Wood	36.5%	R+10.3
Wyandot	19.6%	R+51.6

Seneca County sits higher than 49 of the 88 counties measured on share 25+ with a bachelor's degree or higher. Bachelor's-degree share and the presidential vote

Adult smoking and the presidential voteAcross Ohio's 88 counties the 2024 Republican presidential margin runs higher where a larger share of adults smokes (Spearman rho 0.56; partial rho 0.22 with log population held fixed; 0.54 without Cuyahoga and Franklin; n = 88).Source: University of Wisconsin Population Health Institute / RWJF · as of 2026-09 · Download this chart

The numbers behind this figure, as a table

Adult smoking and the presidential vote
County	Adult smoking (County Health Rankings, 2024)	Presidential margin, 2024 (R minus D, points)
Adams	24.8%	R+66.1
Allen	21.9%	R+44.5
Ashland	21.1%	R+50.4
Ashtabula	26.8%	R+28.6
Athens	21.0%	D+10.8
Auglaize	18.8%	R+65.1
Belmont	22.2%	R+47.6
Brown	24.3%	R+61.8
Butler	18.1%	R+26.5
Carroll	22.5%	R+55.2
Champaign	21.3%	R+51.2
Clark	21.9%	R+29.8
Clermont	19.7%	R+36.1
Clinton	21.9%	R+55.1
Columbiana	22.5%	R+49.4
Coshocton	25.1%	R+52.6
Crawford	23.1%	R+53.4
Cuyahoga	18.7%	D+31.7
Darke	21.6%	R+65.8
Defiance	19.4%	R+40.2
Delaware	11.1%	R+6.7
Erie	20.1%	R+14.3
Fairfield	18.1%	R+24.3
Fayette	24.4%	R+55.6
Franklin	17.0%	D+28.7
Fulton	19.3%	R+42.8
Gallia	23.1%	R+59.8
Geauga	16.4%	R+24.3
Greene	15.9%	R+20.0
Guernsey	23.9%	R+52.4
Hamilton	17.2%	D+15.0
Hancock	19.2%	R+38.9
Hardin	23.1%	R+55.2
Harrison	23.2%	R+55.7
Henry	19.8%	R+47.1
Highland	24.7%	R+63.7
Hocking	24.4%	R+44.6
Holmes	26.8%	R+69.7
Huron	21.6%	R+44.4
Jackson	24.6%	R+58.4
Jefferson	24.1%	R+44.4
Knox	20.5%	R+45.3
Lake	17.2%	R+14.5
Lawrence	24.1%	R+50.9
Licking	17.8%	R+30.3
Logan	21.1%	R+56.7
Lorain	19.4%	R+5.8
Lucas	19.7%	D+12.7
Madison	20.8%	R+44.1
Mahoning	21.4%	R+9.5
Marion	24.1%	R+41.7
Medina	16.1%	R+25.0
Meigs	27.4%	R+57.4
Mercer	18.9%	R+67.2
Miami	18.3%	R+45.5
Monroe	23.6%	R+60.3
Montgomery	18.7%	D+0.5
Morgan	26.4%	R+53.6
Morrow	21.5%	R+56.2
Muskingum	21.5%	R+44.3
Noble	24.5%	R+65.1
Ottawa	18.9%	R+25.3
Paulding	21.8%	R+56.8
Perry	24.5%	R+54.9
Pickaway	21.2%	R+49.0
Pike	27.2%	R+54.0
Portage	19.0%	R+15.7
Preble	20.6%	R+59.6
Putnam	17.3%	R+69.4
Richland	23.5%	R+42.7
Ross	23.1%	R+39.7
Sandusky	20.8%	R+31.1
Scioto	27.4%	R+48.2
Seneca	21.6%	R+37.9
Shelby	21.4%	R+65.3
Stark	21.3%	R+22.1
Summit	19.3%	D+7.0
Trumbull	22.6%	R+16.9
Tuscarawas	22.5%	R+43.6
Union	15.0%	R+29.9
Van Wert	21.0%	R+59.0
Vinton	27.7%	R+59.0
Warren	14.4%	R+31.8
Washington	23.2%	R+44.1
Wayne	20.9%	R+39.6
Williams	21.2%	R+48.7
Wood	16.6%	R+10.3
Wyandot	19.8%	R+51.6

Seneca County sits higher than 48 of the 88 counties measured on adult smoking (County Health Rankings). Adult smoking and the presidential vote

Every published insight

Rain and snow

How much has actually fallen on Seneca County, day by day, from 1893 to now. Daily totals, not averages.

rain, last 30 days: 1.19 in; 2026-09-29 to 2026-10-28

rain so far in 2026: 31.4 in; about normal for the date

snow so far in 2026: 23.0 in; a normal year brings 30.8 in

a normal year: 38.5 in; average of 30 years, 1991-2020

The last twelve months
Month	Rain (in)	Snow (in)	Days counted
October 2026	1.19	—	28
September 2026	2.82	—	30
August 2026	3.89	—	31
July 2026	2.08	—	31
June 2026	3.63	—	30
May 2026	5.08	—	31
April 2026	6.97	—	30
March 2026	3.84	2.1	31
February 2026	0.42	4.5	28
January 2026	1.49	16.5	31
December 2025	2.83	12.3	31
November 2025	1.50	4.0	30

On the record, 1893–2026
Wettest year	2011 — 63.8 in
Driest year	1934 — 23.6 in
Snowiest year	1910 — 87.0 in
Wettest day on record	23 July 2011 — 5.72 in
Heaviest snowfall in a day	10 November 1913 — 14.02 in
Deepest snow on the ground	27 January 1978 — 20.98 in

Almost every day here is a measurement: 97% of them come from a rain gauge standing inside Seneca County itself.

48,726 days of records, 1893-04-01 to 2026-10-28. Source: NOAA NCEI GHCN-Daily, 3,240 gauges in and around Ohio. A day is "gauged" when a gauge standing inside the boundary reported it, and the value is the mean of those gauges. Otherwise it is interpolated by inverse distance from every gauge reporting within 50 miles. Nothing is carried forward, back-filled or smoothed. Against NOAA nClimDiv county monthly precipitation over 136,848 complete county-months (checked 2026-10-31): correlation 0.9515, median absolute difference 0.217 in a month. Built 2026-10-31 from the Cracked Buckeye precipitation archive. Snow is the softer number — snowfall is measured by hand with a ruler, no agency publishes a gridded county snowfall series, and blowing snow defeats every observer.

Environmental permits and filings

What Ohio EPA has on file for Seneca County: permits, inspections, violations, cleanups and the state loans behind sewer and water work. Every line links to the agency's own document.

facilities and sites on file: 1,229; everything Ohio EPA files under this county

private households: 225; counted, not named: permits filed under a person's name

What kind of permits
Program	Facilities and sites
Sewer and water-line construction	466
Wastewater and stormwater discharge	297
Public drinking water	136
Hazardous waste	71
Air pollution	69
State sewer loans	39
Voluntary cleanup	31
Spills and emergencies	24
Wetland and stream fill	21
Contaminated-site cleanup	17
Site assessment	14
State water loans	8
14 smaller programs

The latest filings
Date	Facility or site	What
Oct 9, 2026	BLOOMVILLE WWTP	Wastewater and stormwater discharge report
Oct 8, 2026	HEITSCHE BOYZ CRUSHING INC	Air pollution director's approval
Oct 8, 2026	WIN WASTE INNOVATIONS OF SENECA COUNTY LLC	Landfills permit
Oct 7, 2026	BROOK PARK ESTATES MHP PWS	Public drinking water compliance letter
Oct 7, 2026	WIN WASTE INNOVATIONS OF SENECA COUNTY LLC	Landfills inspection
Oct 7, 2026	I C TREATS PWS	Public drinking water inspection
Oct 6, 2026	EVERGREEN POPLAR MHP PWS	Public drinking water notice of violation
Oct 6, 2026	INDUSTRIAL DIMENSIONS INC, FOSTORIA	Voluntary cleanup inspection
Oct 6, 2026	WIN WASTE INNOVATIONS OF SENECA COUNTY LLC	Landfills inspection
Oct 5, 2026	FOSTORIA AUTOMOTIVE DISTRIBUTION CENTER PWS	Public drinking water compliance letter
Oct 5, 2026	FOSTORIA CITY PWS	Public drinking water compliance letter
Oct 5, 2026	WIN WASTE INNOVATIONS OF SENECA COUNTY LLC	Landfills inspection
Oct 5, 2026	BROOK PARK ESTATES MHP PWS	Public drinking water compliance letter
Oct 2, 2026	WIN WASTE INNOVATIONS OF SENECA COUNTY LLC	Air pollution permit
Oct 2, 2026	NOX US LLC	Voluntary cleanup inspection
Oct 2, 2026	I C TREATS PWS	Public drinking water inspection
Oct 2, 2026	CLINTON HEIGHTS GOLF COURSE PWS	Public drinking water inspection
Oct 2, 2026	SONOCO PRODUCTS CO	Wastewater and stormwater discharge permit
Oct 1, 2026	TIFFIN LOADER CRANE COMPANY PWS	Public drinking water compliance letter
Oct 1, 2026	SENECA COUNTY CREMATORY LLC	Air pollution report
Oct 1, 2026	CAMP GLEN PWS	Public drinking water inspection
Oct 1, 2026	FOSTORIA CITY PWS	Public drinking water notice of violation
Sep 30, 2026	BETTSVILLE VILLAGE PWS	Public drinking water violation resolved
Sep 30, 2026	WIN WASTE INNOVATIONS OF SENECA COUNTY LLC	Landfills inspection
Sep 30, 2026	CAMP GLEN PWS	Public drinking water notice of violation

Source: Ohio EPA eDocument portal (edocpub.epa.ohio.gov), indexed 2026-10-14. Facilities are placed on the map from Ohio EPA's own map layers, EPA's Facility Registry, coordinates written in the filings, or a geocoded street address. A permit filed under a private person's name (most are household septic systems) is counted but never named, placed or linked; licenses for individual workers and open-burning notices are left out entirely.

Quick answers

What is the county seat of Seneca County, Ohio?

Tiffin is the county seat of Seneca County, Ohio. Source

When was Seneca County, Ohio established?

Seneca County was established on April 1, 1820. Source

What is the population of Seneca County, Ohio?

Seneca County had 54,522 residents (July 2025 estimate).

How did Seneca County, Ohio vote in the 2024 presidential election?

In the November 5, 2024 presidential election, Seneca County voters cast 25,263 votes for president: Kamala D Harris (D) 30.7%, Chase Oliver (L) 0.5%, Donald J Trump (R) 68.2%. Donald J Trump carried the county. Source

How did Seneca County get its name?

Named for the Seneca of Sandusky, whose reservation on the Sandusky River covered much of the county's eastern townships from 1817 until their 1831-32 removal. Source

How many cities, villages and townships are in Seneca County, Ohio?

Seneca County has 26 cities, villages and townships, and 13 ZIP codes reach into it.

Notable people from Seneca County

Ohioans tied to this place, each with a sourced profile. All notable Ohioans

History from Seneca County

People and inventions tied to this place, each with its sources. All people · All inventions

Cite and data

Cite this page as:

Cracked Buckeye, "Seneca County", https://crackedbuckeye.com/county/seneca/, built 2026-10-31, accessed [date].

How to cite · Report a correction · Built 2026-10-31

Seneca County, Ohio

Local events in Seneca County

Sandusky River Trail Fun Run/Walk & Paddle

HS Boys/Girls Cross Country at Div. IV Regional Meet (Hedges Boyer Park)

Daylight Saving Time ends

Seneca County in numbers

Population

Moving in and out

Income and poverty

Jobs and wages

The county economy

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What stands out

Places

Cities 2

Villages 6

Townships 18

ZIP codes

On the map

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Townships and villages without a page of their own

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Rain and snow

Environmental permits and filings