Local events in Mason
26 events in the next 90 days from 5 public calendars. All local events in Mason
Checked October 20; the events page is refreshed daily.
Deep dives about Mason
Long reads built from maps, newspapers and public records. All deep dives
How Mason began
Mason grew from a 640-acre tract that Revolutionary War veteran William Mason bought at auction in 1803 on the Cincinnati-Columbus wagon road between the Great and Little Miami Rivers; he platted it in 1815 as 'Palmira,' and the post office renamed it Mason in 1835 because Ohio already had a Palmyra. It stayed a small farm and crossroads village for well over a century, incorporating in 1839-40 with fewer than a few hundred residents and still under 5,700 as late as 1970. The 1972 opening of Kings Island (relocated from flood-prone Coney Island) and the 1979 move of Cincinnati's professional tennis tournament to what became the Lindner Family Tennis Center turned Mason into a regional entertainment and sports destination, and interstate access pulled in corporate offices and subdivisions. Mason became a home-rule city in 1971 and by 2020 had grown to 34,792 residents, one of the fastest-growing cities in the Cincinnati area.
Settled 1803, platted 1815, incorporated 1839 (as a village, effective March 1840); 1971 (as a home-rule city), by William Mason, a Revolutionary War veteran who purchased the 640-acre site at auction on June 1, 1803.
Where the name comes from
William Mason platted 16 lots on his land in 1815 and named the settlement 'Palmira' (also spelled Palmyra). The community was also informally known as Kirkwood for a time, apparently for postmaster William Kirkwood. In 1835, when officials learned another Ohio post office already held the name Palmyra, residents petitioned the federal post office to rename the village 'Mason' in honor of its founder; Van Buren was reportedly considered and rejected as an alternative.
Before the town
No village, camp, or burial site specific to present-day Mason or Mason Township is recorded in the sources checked. The 1882 county history (Beers) states plainly that Warren County as a whole had no permanent Native settlements at the time of white exploration and settlement: 'There is not a town or settlement upon its soil,' and no tribe is known to have lived within the county's limits after the prehistoric Mound-Builders departed. The Miami claimed the broader region of western Ohio as hunting territory without residing there; a decade or so before the Revolutionary War the Miami withdrew north to the Maumee and the Shawnee took up the headwaters of the two Miami Rivers, the tribe most often encountered by early Warren County settlers. Some historians speculated southwestern Ohio was kept open as shared or contested hunting ground between northern and southern tribes rather than settled outright. Warren County's major documented Native American presence is architectural rather than residential: the Hopewell culture's Fort Ancient hilltop earthworks, built roughly 100 BC to AD 400 in Washington Township about seven miles southeast of Lebanon and inscribed in 2023 as part of Ohio's first UNESCO World Heritage Site, along with smaller mound groups (Landen Mounds, Moar Mound and Village) elsewhere in the county. None of these sites lie within Mason's boundaries.
Nations recorded here: Miami, Shawnee, Hopewell culture, Adena culture, Fort Ancient culture.
- Fort Ancient Earthworks (earthwork) — Washington Township, Warren County, about 7 miles southeast of Lebanon (not within Mason's boundaries), Hopewell culture, c. 100 BC - AD 400, with later Fort Ancient culture reuse (ohiohistory.org)
Timeline
- — William Mason, a Revolutionary War veteran, buys 640 acres at auction for $1,700 in what is now downtown Mason, on land between the Great and Little Miami Rivers.
- — Mason plats 16 lots on the tract and names the settlement 'Palmira,' with Main Street deliberately angled to give it an east-west orientation along the existing Cincinnati-Columbus road.
- — The village, recorded as Palmyra and briefly known as Kirkwood, is officially renamed Mason after residents learn another Ohio post office already used the name Palmyra.
- — The Ohio General Assembly enacts Mason's incorporation as a village on January 22, 1839; residents formally accept it in March 1840 and elect Mason Seward as first mayor.
- — The narrow-gauge Cincinnati & Northern Railway reaches Mason, later widened to standard gauge and renamed the Cincinnati, Lebanon and Northern in 1894.
- — An electric interurban trolley, the Rapid Railway, runs through the Mason area carrying workers to the King Powder Company and Peters Cartridge Company plants at nearby Kings Mills.
- — Main Street, long nicknamed 'Mason Jars' for its rutted, muddy condition, is paved for the first time.
- — Cincinnati broadcaster Powel Crosley Jr. moves his WLW radio transmitter operations to Mason, later boosting it to 500,000 watts (with President Franklin D. Roosevelt formally switching on the super-power signal on May 2, 1934), making it briefly the most powerful commercial radio station in the country.
- — Mason voters approve a home-rule governing charter in 1969; with population past 5,000 the village becomes the City of Mason in 1971.
- — Kings Island amusement park opens on April 29, 1972, on former farmland in Mason after Taft Broadcasting relocated Coney Island from its flood-prone site on the Ohio River.
- — Cincinnati's professional tennis tournament, previously held at Coney Island, breaks ground on a permanent stadium in Mason (using bleachers trucked up from Coney Island for its first Center Court), the future Lindner Family Tennis Center.
- — The Cincinnati Water Works begins selling water to Mason on a wholesale basis.
- — Greater Cincinnati Water Works (GCWW) assumes full operation of Mason's water treatment plant and distribution system under a 30-year agreement.
- — Mason's population reaches 34,792 in the U.S. Census, up from fewer than 5,700 in 1970.
Stories
From Coney Island to Kings Island
For decades, Cincinnatians took the trolley or drove to Coney Island, an amusement park hugging a bend of the flood-prone Ohio River. A catastrophic 1964 flood put the park under more than 14 feet of water and convinced its owners the site had no future. In July 1969, Taft Broadcasting bought Coney Island for $6.5 million along with 1,600 acres of farmland in Mason for $3.2 million, and construction began in June 1970. When Kings Island opened its gates on April 29, 1972, it carried pieces of the old park with it: rides were trucked up, and some of Coney Island's ginkgo trees were transplanted to line the new Coney Mall. The wooden coaster The Racer became an instant sensation credited with reviving roller coaster design nationwide, and stunts like Karl Wallenda's 1974 tightrope walk and Evel Knievel's 1975 bus jump kept the park in the national spotlight. What had been quiet Mason farmland was now a regional destination, and the town's population and tax base began climbing within a few years.
The tennis stadium built on borrowed bleachers
Cincinnati's tennis tournament, first played in 1899, is the oldest tournament in the United States still contested in its original city. By the 1970s it had moved to Coney Island, but the same riverside flooding that doomed the amusement park threatened the tennis event too. In 1979, tournament organizers accepted an offer from Taft Broadcasting chairman Charles Mechem to build a permanent home on land next to Kings Island in Mason. The first four courts were modest, and for Center Court the grounds crew literally hauled the old bleachers from Coney Island up Interstate 71 and set them around one court. Those borrowed stands were soon replaced by permanent construction, and the facility - later named the Lindner Family Tennis Center - grew through repeated expansions (1981, 1987, 1990, 1998, 2010, 2011, and a 2025 addition) into a 31-court, five-stadium complex, the only tennis venue outside the four Grand Slams with more than two permanent stadia. The tournament, known for years as the Western & Southern Open, reclaimed the name Cincinnati Open for its 2024 edition.
The nation's loudest radio station
In 1928 Cincinnati broadcaster Powel Crosley Jr. moved the transmitter for his station WLW to a site in Mason and kept boosting its power. By 1934 WLW was broadcasting at 500,000 watts from an 831-foot Blaw-Knox diamond-shaped antenna, ten times the strength of any other station in the country; President Franklin Roosevelt threw the switch for the super-power signal by remote control on May 2, 1934. Complaints about interference eventually got the power capped back to 50,000 watts, but the tower still stands as a Mason landmark.
An escaped troop of baboons
Ten days before Kings Island opened in 1976, about 50 olive baboons brought in for the park's Lion Country Safari scaled their supposedly escape-proof 12-foot fence and scattered. Handlers rounded up most of them with tranquilizer-laced fruit and wooden traps; one baboon that made it 20 miles from the park resisted capture and was shot. The animals were shipped back to the Michigan company that had sold them.
Photographs
Photo: Nyttend, public domain · Wikimedia Commons
Photo: Nyttend, public domain · Wikimedia Commons
Photo: Jeremy Thompson, CC BY 2.0 · Wikimedia Commons
Photo: Fritzmann2002, CC BY-SA 4.0 · Wikimedia Commons
Local history sources: en.wikipedia.org · en.wikipedia.org · imaginemason.org · masonhistoricalsociety.org · sites.rootsweb.com · warren.ohgenweb.org · sites.rootsweb.com · warren.ohgenweb.org · en.wikipedia.org · en.wikipedia.org · en.wikipedia.org · wvxu.org · wcpo.com · cincinnati-oh.gov · ohiohistory.org · en.wikipedia.org · en.wikipedia.org · en.wikipedia.org · commons.wikimedia.org · commons.wikimedia.org · commons.wikimedia.org · commons.wikimedia.org
Water
Ohio River intake at the plant's riverfront on Kellogg Ave in the California neighborhood, east Cincinnati The water here
- Cincinnati Public Water System66% of residentsOhio River (Miller Plant, ~88%) plus Great Miami Buried Valley Aquifer wells (~12%)
- Warren Co. Socialville26% of residentsOhio River (Miller Plant, ~88%) plus Great Miami Buried Valley Aquifer wells (~12%)
- Butler Co. Water District 24% of residentsHamilton wells (Great Miami aquifer) + Cincinnati (Ohio River + wells)
- Warren County2% of residentsWells in the Little Miami and Great Miami river valley aquifers
- Lebanon City2% of residentsOhio River + Great Miami Aquifer (via Cincinnati GCWW)
- Western Water Company0% of residentsLittle Miami River valley wells (51%) plus Cincinnati Ohio River water (49%)
- Warren Co. Pennyroyal Area0% of residentsGreat Miami Buried Valley Aquifer (own wells)
Hospitals, fire stations and more
Inside Mason's boundary: 3 hospitals, 3 nursing homes, 3 fire and EMS stations, 1 high-hazard dam, 4 public schools, 5 private schools, 1 library, 2 museums, 1 police station, 2 public charging sites, 1 Superfund site, 13 Toxics Release Inventory facilities and 16 spill cases. Press a pin or a name for its whole record and its source.
Hospitals (3)
-
Cincinnati Children's Hospital Medical Center at T Trauma level IPsychiatric hospital · Mason
- What it is
- Psychiatric hospital
- Address
- 4075 Old Western Row Road, Mason, OH 45040
- County
- Warren County
- Beds
- 16
- Trauma center
- Level I Pediatric
- Ownership
- Non-profit
- Phone
- (513) 803-0505
Where HIFLD got this record ↗ HIFLD hospitals (source) ↗ Street map and directions ↗
-
Lindner Center of HopePsychiatric hospital · Mason
- What it is
- Psychiatric hospital
- Address
- 4075 Old Western Row Road, Mason, OH 45040
- County
- Warren County
- Beds
- 34
- Ownership
- Non-profit
- Medicare overall rating
- not rated
- Emergency department (Medicare)
- No
- Phone
- (513) 536-4673
- Medicare ID
- 364044
Medicare Care Compare ↗ Where HIFLD got this record ↗ HIFLD hospitals (source) ↗ Street map and directions ↗
-
Mercy Health - Kings Mill HospitalGeneral hospital · Mason
- What it is
- General hospital
- Address
- 5440 Kings Island Drive, Mason, OH 45040
- County
- Warren County
- Beds
- 60
- Ownership
- Non-profit
- Medicare overall rating
- not rated
- Emergency department (Medicare)
- Yes
- Medicare reports it as
- Mercy Health Kings Mills Hospital Llc
- Phone
- (513) 637-9999
- Medicare ID
- 360374
Medicare Care Compare ↗ Where HIFLD got this record ↗ HIFLD hospitals (source) ↗ Street map and directions ↗
Source: HIFLD hospitals inventory via FEMA (closed hospitals it still lists left out, hospitals opened since added), with Medicare Care Compare ratings matched by name and address.
Nursing homes (3)
-
Majestic Care of Cedar Village.2 of 5 stars · Mason
- Address
- 5467 Cedar Village Drive, Mason, OH 45040
- Certified beds
- 162
- Residents on an average day
- 153
- Medicare overall rating
- 2 of 5 stars
- Health inspections
- 1 of 5 stars
- Staffing
- 2 of 5 stars
- Quality measures
- 5 of 5 stars
- Penalties since 2023
- 1 fine totalling $62,205, 1 payment denial (latest 2024-04-03)
- Ownership
- For profit - Limited Liability company
- Chain
- MAJESTIC CARE
- Takes
- Medicare and Medicaid
- Phone
- (513) 754-3100
- Medicare ID
- 366120
Medicare Care Compare ↗ CMS nursing home data (source) ↗ Street map and directions ↗
-
Mason Health Care Center3 of 5 stars · Mason
- Address
- 5640 Cox-Smith Road, Mason, OH 45040
- Certified beds
- 53
- Residents on an average day
- 39
- Medicare overall rating
- 3 of 5 stars
- Health inspections
- 3 of 5 stars
- Staffing
- 2 of 5 stars
- Quality measures
- 3 of 5 stars
- Penalties since 2023
- none
- Ownership
- For profit - Partnership
- Takes
- Medicare and Medicaid
- Phone
- (513) 398-2881
- Medicare ID
- 366216
Medicare Care Compare ↗ CMS nursing home data (source) ↗ Street map and directions ↗
-
Mcv Health Care Facilities, Inc5 of 5 stars · Mason
- Address
- 411 Western Row Road, Mason, OH 45040
- Certified beds
- 73
- Residents on an average day
- 61
- Medicare overall rating
- 5 of 5 stars
- Health inspections
- 5 of 5 stars
- Staffing
- 5 of 5 stars
- Quality measures
- 5 of 5 stars
- Penalties since 2023
- none
- Ownership
- Non profit - Church related
- Continuing care retirement community
- Yes
- Takes
- Medicare and Medicaid
- Phone
- (513) 398-1486
- Medicare ID
- 365894
Medicare Care Compare ↗ CMS nursing home data (source) ↗ Street map and directions ↗
Source: CMS Care Compare nursing home provider and penalties files; Medicare star ratings run 1 to 5.
Fire and EMS stations (3)
-
City of Mason Fire Station 51Mason
- Address
- 4420 Mason - Montgomery Road, Mason, OH 45040
- Coordinates
- 39.37372, -84.30719
USGS National Map structures (source) ↗ Street map and directions ↗
-
City of Mason Fire Station 52Mason
- Address
- 5500 Cedar Village Drive, Mason, OH 45040
- Coordinates
- 39.32953, -84.31907
USGS National Map structures (source) ↗ Street map and directions ↗
-
Kings Island Fire Department - Warren County Station 55Mason
- Address
- 6300 Kings Island Drive, Mason, OH 45040
- Coordinates
- 39.34133, -84.27222
USGS National Map structures (source) ↗ Street map and directions ↗
Source: USGS National Map structures (most Ohio records last updated 2019 to 2022), checked against the Columbus and Cleveland station lists. The department that answers a call is set by jurisdiction and mutual aid, not by distance.
High-hazard dams (1)
-
Pine Hill Lake DamTributary To Muddy Creek · condition: satisfactory
- Hazard class
- High: a failure would probably cost a life
- Condition
- Satisfactory (assessed 03/18/2025)
- River or stream
- Tributary To Muddy Creek
- Purpose
- Recreation
- Type
- Earth
- Height
- 31 ft
- Storage
- 194 acre-feet
- Owner type
- Local Government
- County
- Warren County
- Nearest town (NID)
- Mason
- Last inspection
- 04/03/2024
- Emergency action plan
- Yes
- NID ID
- OH00542
National Inventory of Dams record ↗ National Inventory of Dams (source) ↗ Street map and directions ↗
Source: U.S. Army Corps of Engineers National Inventory of Dams, August 2026. "High hazard" rates what a failure would cost downstream, not how likely one is; the condition is the state's assessment.
Public schools (4)
-
Mason Early Childhood Center Elementary School5 of 5 stars · Mason
- Address
- 4631 Hickory Woods Dr, Mason, OH 45040
- School district
- Mason City School District
- Kind (NCES)
- Regular School
- Students, 2023-24
- 2,102
- Teachers (full-time equivalent)
- 94.2
- Report card, 2025-26
- 5 of 5 stars
- Ohio building IRN
- 121871
- NCES school ID
- 390504501106
NCES school record ↗ Ohio School Report Card ↗ Street map and directions ↗
-
Mason Intermediate Elementary School5 of 5 stars · Mason
- Address
- 6307 S Mason Montgomery Rd, Mason, OH 45040
- School district
- Mason City School District
- Kind (NCES)
- Regular School
- Students, 2023-24
- 3,034
- Teachers (full-time equivalent)
- 150.5
- Report card, 2025-26
- 5 of 5 stars
- Performance index
- 93.5%
- Ohio building IRN
- 126193
- NCES school ID
- 390504501468
NCES school record ↗ Ohio School Report Card ↗ Street map and directions ↗
-
Mason Middle School5 of 5 stars · Mason
- Address
- 6370 S Mason Montgomery Rd, Mason, OH 45040
- School district
- Mason City School District
- Kind (NCES)
- Regular School
- Students, 2023-24
- 1,665
- Teachers (full-time equivalent)
- 82.5
- Report card, 2025-26
- 5 of 5 stars
- Performance index
- 92.6%
- Ohio building IRN
- 005363
- NCES school ID
- 390504503952
NCES school record ↗ Ohio School Report Card ↗ Street map and directions ↗
-
William Mason High School5 of 5 stars · Mason
- Address
- 6100 S Mason Montgomery Rd, Mason, OH 45040
- School district
- Mason City School District
- Kind (NCES)
- Regular School
- Students, 2023-24
- 3,488
- Teachers (full-time equivalent)
- 141.5
- Report card, 2025-26
- 5 of 5 stars
- Performance index
- 94.4%
- Four-year graduation rate
- 98.2%
- Ohio building IRN
- 041376
- NCES school ID
- 390504503954
NCES school record ↗ Ohio School Report Card ↗ Street map and directions ↗
Source: NCES EDGE public school locations 2024-25 and Common Core of Data 2023-24 (type, students, teachers); Ohio School Report Cards 2025-26 (Department of Education and Workforce), matched by name within the district.
Private schools (5)
-
Chai Tots Montessori SchoolPrivate, religious, independent · Mason
- Address
- 7587 Central Parke Blvd, Mason, OH 45040
- Kind
- religious, independent
- Students, 2023-24
- 4
- Teachers (full-time equivalent)
- 2
- Students per teacher
- 2
- Phone
- (513) 234-0777
- NCES private school ID
- A1302269
-
Primrose School of MasonPrivate, nonsectarian · Mason
- Address
- 5888 Snider Rd, Mason, OH 45040
- Kind
- nonsectarian
- Students, 2023-24
- 17
- Teachers (full-time equivalent)
- 1
- Students per teacher
- 17
- Phone
- (513) 336-6756
- NCES private school ID
- A1903472
-
Royalmont AcademyPrivate, Catholic · Mason
- Address
- 200 Northcrest Dr, Mason, OH 45040
- Kind
- Catholic
- Students, 2023-24
- 147
- Teachers (full-time equivalent)
- 21.6
- Students per teacher
- 6.80556
- Phone
- (513) 754-0555
- NCES private school ID
- A0302492
-
St Susanna Elementary SchoolPrivate, Catholic · Mason
- Address
- 500 Reading Rd, Mason, OH 45040
- Kind
- Catholic
- Students, 2023-24
- 628
- Teachers (full-time equivalent)
- 34.6
- Students per teacher
- 18.1503
- Phone
- (513) 398-3821
- NCES private school ID
- 01056074
-
The Goddard School - Mason IPrivate, nonsectarian · Mason
- Address
- 754 Reading Rd, Mason, OH 45040
- Kind
- nonsectarian
- Students, 2023-24
- 10
- Teachers (full-time equivalent)
- 1
- Students per teacher
- 10
- Phone
- (513) 398-2777
- NCES private school ID
- A1503027
Source: NCES Private School Survey 2023-24.
Public libraries (1)
-
Mason Public LibraryCentral library · Mason
- Address
- 200 Reading Rd., Mason, OH 45040
- What it is
- Central library
- Library system
- Mason Public Library
- Open
- 672 hours a year, 52 weeks
- Building
- 29,974 sq ft
- System's visits, FY2024
- 52,000
- System's loans, FY2024
- 1,093,140
- People the system serves
- 75,139
- Phone
- (513) 398-2711
IMLS Public Libraries Survey (source) ↗ Street map and directions ↗
Source: IMLS Public Libraries Survey FY2024 (outlets and their systems). Any Ohio resident can get a free card at any Ohio public library.
Museums, historical societies, gardens and zoos (2)
-
Alverta Green MuseumMuseum · Mason
- What it is
- Museum
- City
- Mason
- Coordinates
- 39.36131, -84.31055
Search Wikipedia ↗ IMLS Museum Data Files (source) ↗ Street map and directions ↗
The museum list is IMLS's 2018 file; a museum may have closed or moved since.
-
Mason Historical SocietyHistorical society · Mason
- What it is
- Historical society
- City
- Mason
- Coordinates
- 39.36131, -84.31055
Search Wikipedia ↗ IMLS Museum Data Files (source) ↗ Street map and directions ↗
The museum list is IMLS's 2018 file; a museum may have closed or moved since.
Source: IMLS Museum Data Files, 2018.
Police stations (1)
-
Mason Police DepartmentMason
- Address
- 6000 Mason - Montgomery Road, Mason, OH 45040
- Coordinates
- 39.35376, -84.30782
USGS National Map structures (source) ↗ Street map and directions ↗
Source: USGS National Map structures, police stations, corrected and completed by hand (September 2026). The department that answers a call is set by jurisdiction, not by distance.
Public EV charging (2)
-
City of Mason Public Parking Lot2 Level 2 · Mason
- Address
- 213 West Main Street, Mason, OH 45040
- Ports
- 2 Level 2
- Plugs
- J1772
- Network
- Blink Network
- Hours
- 24 hours daily
- Phone
- 888-998-2546
Station Locator (NREL) ↗ Alternative Fuels Data Center (source) ↗ Street map and directions ↗
-
SCC. SCC MASON SOUTH4 Level 2 · Mason
- Address
- 5386 Courseview Dr, Mason, OH 45040
- Ports
- 4 Level 2
- Plugs
- J1772
- Network
- ChargePoint Network
- Hours
- 24 hours daily
- Phone
- 888-758-4389
Station Locator (NREL) ↗ Alternative Fuels Data Center (source) ↗ Street map and directions ↗
Source: NREL Alternative Fuels Data Center station list (May 2026), public and open stations, the posts at one address counted as one site.
Superfund sites (1)
-
Mason Road Lead SiteSuperfund program · Mason
- Address
- 4631 Hickory Woods Drive, Mason, OH 45040
- County
- Warren County
- Status
- Superfund program site, not on the National Priorities List
- EPA program ID
- OHN000509181
- EPA registry ID
- 110017945410
EPA facility record ↗ EPA Facility Registry Service (source) ↗ Street map and directions ↗
Source: EPA Facility Registry Service, Superfund (SEMS) and National Priorities List sites. Many program sites were assessed and needed no cleanup.
Facilities reporting toxic releases (13)
-
Air Plastics Inc.Toxics Release Inventory · Mason
- Address
- 1224 Castle Dr., Mason, OH 45040
- County
- Warren County
- Status
- Reports to the Toxics Release Inventory (active)
- EPA program ID
- 45040RPLST1224C
- EPA registry ID
- 110000392478
EPA facility record ↗ EPA Facility Registry Service (source) ↗ Street map and directions ↗
-
Armor Metal GroupToxics Release Inventory · Mason
- Address
- 4600 Mason Montgomery Road, Mason, OH 45040
- County
- Warren County
- Status
- Reports to the Toxics Release Inventory (active)
- EPA program ID
- 45040MLDCR4600M
- EPA registry ID
- 110000815618
EPA facility record ↗ EPA Facility Registry Service (source) ↗ Street map and directions ↗
-
Berenfield Containers IncToxics Release Inventory · Mason
- Address
- 1229 - 1234 Castle Dr, Mason, OH 45040
- County
- Warren County
- Status
- Reports to the Toxics Release Inventory (open)
- EPA program ID
- 45040BRNFL1229C
- EPA registry ID
- 110000392432
EPA facility record ↗ EPA Facility Registry Service (source) ↗ Street map and directions ↗
-
Blackhawk Automotive Plastics, Inc.Toxics Release Inventory · Mason
- Address
- 4219 Us Route 42, Mason, OH 45040
- County
- Warren County
- Status
- Reports to the Toxics Release Inventory (active)
- EPA program ID
- 45040HMLTN4219U
- EPA registry ID
- 110000392441
EPA facility record ↗ EPA Facility Registry Service (source) ↗ Street map and directions ↗
-
Bonsal American Inc This Facility Closed As of 11/30/2010Toxics Release Inventory · Mason
- Address
- 7300 Indl. Row Dr., Mason, OH 45040
- County
- Warren County
- Status
- Reports to the Toxics Release Inventory (closed)
- EPA program ID
- 45040WRBNS7300I
- EPA registry ID
- 110002112767
EPA facility record ↗ EPA Facility Registry Service (source) ↗ Street map and directions ↗
-
Cincinnati Electronics CorpToxics Release Inventory · Mason
- Address
- 7500 Innovation Way, Mason, OH 45040
- County
- Warren County County
- Status
- Reports to the Toxics Release Inventory (***unchanged***)
- EPA program ID
- 4504WCNCNN75INN
- EPA registry ID
- 110068741552
EPA facility record ↗ EPA Facility Registry Service (source) ↗ Street map and directions ↗
-
Cincinnati Fan and Ventilator CompanyToxics Release Inventory · Mason
- Address
- 7697 Snider Rd, Mason, OH 45040
- County
- Warren County County
- Status
- Reports to the Toxics Release Inventory (***unchanged***)
- EPA program ID
- 4504WCNCNN7697S
- EPA registry ID
- 110071140747
EPA facility record ↗ EPA Facility Registry Service (source) ↗ Street map and directions ↗
-
Hamilton Products Group, IncToxics Release Inventory · Mason
- Address
- 755 Reading Rd, Mason, OH 45040
- County
- Warren County
- Status
- Reports to the Toxics Release Inventory (active)
- EPA program ID
- 45040HMLTN755RE
- EPA registry ID
- 110006428838
EPA facility record ↗ EPA Facility Registry Service (source) ↗ Street map and directions ↗
-
Jw Harris Co Inc Dba Harris Products GroupToxics Release Inventory · Mason
- Address
- 4501 Quality Pl, Mason, OH 45040
- County
- Warren County
- Status
- Reports to the Toxics Release Inventory (active)
- EPA program ID
- 45040JWHRR4501X
- EPA registry ID
- 110004735706
EPA facility record ↗ EPA Facility Registry Service (source) ↗ Street map and directions ↗
-
L-3 Communications Cincinnati ElectronicsToxics Release Inventory · Mason
- Address
- 7500 Innovation Way, Mason, OH 45040
- County
- Warren County
- Status
- Reports to the Toxics Release Inventory (open)
- EPA program ID
- 45040CNCNN75INN
- EPA registry ID
- 110000815404
EPA facility record ↗ EPA Facility Registry Service (source) ↗ Street map and directions ↗
-
Mitsubishi Electric Automotive America (1483090295)Toxics Release Inventory · Mason
- Address
- 4773 Bethany Rd., Mason, OH 45040
- County
- Warren County
- Status
- Reports to the Toxics Release Inventory (open)
- EPA program ID
- 45040MTSBS4773B
- EPA registry ID
- 110000392450
EPA facility record ↗ EPA Facility Registry Service (source) ↗ Street map and directions ↗
-
Portion Pac IncToxics Release Inventory · Mason
- Address
- 7325 Snider Rd., Mason, OH 45040
- County
- Warren County
- Status
- Reports to the Toxics Release Inventory (active)
- EPA program ID
- 45040PRTNP7325S
- EPA registry ID
- 110000392469
EPA facility record ↗ EPA Facility Registry Service (source) ↗ Street map and directions ↗
-
Reliance Medical Products Inc.Toxics Release Inventory · Mason
- Address
- 3535 Kings Mills Rd, Mason, OH 45040
- County
- Warren County
- Status
- Reports to the Toxics Release Inventory (active)
- EPA program ID
- 45040RLNCM3535K
- EPA registry ID
- 110004685029
EPA facility record ↗ EPA Facility Registry Service (source) ↗ Street map and directions ↗
Source: EPA Facility Registry Service, Toxics Release Inventory reporters. Reporting a release is required of large users of listed chemicals; it is not by itself a violation.
Spills reported since 2021 (16)
-
Fuel Diesel / Diesel Fuel (Vehicle On Or Off Road) Reached water2025-11-03 · Mason
- Reported
- 2025-11-03
- What spilled
- Fuel Diesel / Diesel Fuel (Vehicle On Or Off Road)
- Reached a waterway
- 99 - Unnamed
- Where
- Mason, Warren County
- Ohio EPA district office
- SWDO
- Ohio EPA case number
- 2511EPA0001796
Ohio EPA spill reports (source) ↗ Street map and directions ↗
-
Fuel Diesel / Diesel Fuel (Vehicle On Or Off Road)2025-09-24 · Mason
- Reported
- 2025-09-24
- What spilled
- Fuel Diesel / Diesel Fuel (Vehicle On Or Off Road)
- Largest amount reported
- 60 gallons
- Where
- Mason, Warren County
- Ohio EPA district office
- SWDO
- Ohio EPA case number
- 2509EPA0001599
Ohio EPA spill reports (source) ↗ Street map and directions ↗
-
Fuel Diesel / Diesel Fuel (Vehicle On Or Off Road)2025-04-02 · Mason
- Reported
- 2025-04-02
- What spilled
- Fuel Diesel / Diesel Fuel (Vehicle On Or Off Road)
- Where
- Mason, Warren County
- Ohio EPA district office
- SWDO
- Ohio EPA case number
- 2504EPA0000473
Ohio EPA spill reports (source) ↗ Street map and directions ↗
-
Fuel Diesel / Diesel Fuel (Vehicle On Or Off Road)2025-02-19 · Mason
- Reported
- 2025-02-19
- What spilled
- Fuel Diesel / Diesel Fuel (Vehicle On Or Off Road)
- Where
- Mason, Warren County
- Ohio EPA district office
- SWDO
- Ohio EPA case number
- 2502EPA0000228
Ohio EPA spill reports (source) ↗ Street map and directions ↗
-
Sheen Rainbow / Hydrocarbon Reached water2024-07-29 · Mason
- Reported
- 2024-07-29
- What spilled
- Sheen Rainbow / Hydrocarbon
- Reached a waterway
- 99 - Unnamed
- Where
- Mason, Warren County
- Ohio EPA district office
- SWDO
- Ohio EPA case number
- 2407EPA0001296
Ohio EPA spill reports (source) ↗ Street map and directions ↗
-
Battery / Batteries Dry Cell2024-05-02 · Mason
- Reported
- 2024-05-02
- What spilled
- Battery / Batteries Dry Cell
- Where
- Mason, Warren County
- Ohio EPA district office
- SWDO
- Ohio EPA case number
- 2405EPA0000732
Ohio EPA spill reports (source) ↗ Street map and directions ↗
-
Oil Transformer Non Pcb2024-03-15 · Mason
- Reported
- 2024-03-15
- What spilled
- Oil Transformer Non Pcb
- Largest amount reported
- 40 gallons
- Where
- Mason, Warren County
- Ohio EPA district office
- SWDO
- Ohio EPA case number
- 2403EPA0000417
Ohio EPA spill reports (source) ↗ Street map and directions ↗
-
Drum(S)2024-01-04 · Mason
- Reported
- 2024-01-04
- What spilled
- Drum(S)
- Largest amount reported
- 420 gallons
- Where
- Mason, Warren County
- Ohio EPA district office
- SWDO
- Ohio EPA case number
- 2401EPA0000018
Ohio EPA spill reports (source) ↗ Street map and directions ↗
-
Chemical(S) Unk2023-10-10 · Mason
- Reported
- 2023-10-10
- What spilled
- Chemical(S) Unk
- Where
- Mason, Warren County
- Ohio EPA district office
- SWDO
- Ohio EPA case number
- 2310EPA0001744
Ohio EPA spill reports (source) ↗ Street map and directions ↗
-
Material Green Reached water2023-05-09 · Mason
- Reported
- 2023-05-09
- What spilled
- Material Green
- Reached a waterway
- 99 - Unnamed
- Where
- Mason, Warren County
- Ohio EPA district office
- SWDO
- Ohio EPA case number
- 2305EPA0000752
Ohio EPA spill reports (source) ↗ Street map and directions ↗
-
Oil Hydraulic Fluid(S)2022-04-04 · Null
- Reported
- 2022-04-04
- What spilled
- Oil Hydraulic Fluid(S)
- Largest amount reported
- 5 gallons
- Where
- Null, Warren County
- Ohio EPA district office
- SWDO
- Ohio EPA case number
- 2204EPA0000466
Ohio EPA spill reports (source) ↗ Street map and directions ↗
-
Fuel Diesel / Diesel Fuel (Vehicle On Or Off Road)2022-02-02 · Mason
- Reported
- 2022-02-02
- What spilled
- Fuel Diesel / Diesel Fuel (Vehicle On Or Off Road)
- Largest amount reported
- 50 gallons
- Where
- Mason, Warren County
- Ohio EPA district office
- SWDO
- Ohio EPA case number
- 2202EPA0000107
Ohio EPA spill reports (source) ↗ Street map and directions ↗
-
Fuel Diesel / Diesel Fuel (Vehicle On Or Off Road)2021-07-17 · Mason
- Reported
- 2021-07-17
- What spilled
- Fuel Diesel / Diesel Fuel (Vehicle On Or Off Road)
- Largest amount reported
- 90 gallons
- Where
- Mason, Warren County
- Ohio EPA district office
- SWDO
- Ohio EPA case number
- 2107EPA0001065
Ohio EPA spill reports (source) ↗ Street map and directions ↗
-
Paint Waste(S)2021-07-12 · Mason
- Reported
- 2021-07-12
- What spilled
- Paint Waste(S)
- Where
- Mason, Warren County
- Ohio EPA district office
- SWDO
- Ohio EPA case number
- 2107EPA0001032
Ohio EPA spill reports (source) ↗ Street map and directions ↗
-
Oil Transformer Non Pcb2021-06-03 · Mason
- Reported
- 2021-06-03
- What spilled
- Oil Transformer Non Pcb
- Largest amount reported
- 30 gallons
- Where
- Mason, Warren County
- Ohio EPA district office
- SWDO
- Ohio EPA case number
- 2106EPA0000784
Ohio EPA spill reports (source) ↗ Street map and directions ↗
-
Fuel Diesel / Diesel Fuel (Vehicle On Or Off Road)2026-06-11 · Mason
- Reported
- 2026-06-11
- What spilled
- Fuel Diesel / Diesel Fuel (Vehicle On Or Off Road)
- Largest amount reported
- 75 gallons
- Where
- Mason, Warren County
- Ohio EPA district office
- SWDO
- Ohio EPA case number
- 2606EPA0001035
Ohio EPA spill reports (source) ↗ Street map and directions ↗
Source: Ohio EPA emergency response spill reports, 2021 to September 2026, one point per case where Ohio EPA placed it. A report is what the caller or responder recorded; amounts are often blank or estimated.
Its ZIP codes
Each ZIP code that touches Mason, with the share of its residents who live here and the same headline figures as the ZIP page.
Local government
Who holds office in Mason, how its elections and ballot issues came out, and the state auditor's record.
Who holds office
| Office | Name | Party | Term ends | Contact |
|---|---|---|---|---|
| Member of Board of Education | Schools Matt Steele | 11/2/2027 | ||
| Member of Board of Education | Schools Desiree Batsche | 11/2/2027 | ||
| Member of Board of Education | Schools Charles Galvin | 11/6/2029 | ||
| Member of Board of Education | Schools Ian Orr | 11/6/2029 | ||
| Member of Board of Education | Schools Danni Tymitz | 11/6/2029 | ||
| President and OSBA Legislative Liaison (Mason City Schools) | Ian Orr | 2029 | (513) 846-2579 · orri@masonohioschools.com 211 North East Street, Mason, OH 45040 · website | |
| Vice President (Mason City Schools) | Matt Steele | 2027 | (513) 608-4367 · steelem@masonohioschools.com 211 North East Street, Mason, OH 45040 · website | |
| Member (Mason City Schools) | Desiree Batsche | 2027 | (513) 288-1605 · BatscheD@masonohioschools.com 211 North East Street, Mason, OH 45040 · website | |
| Member (Mason City Schools) | Charles Galvin | 2029 | (513) 312-1871 · galvinc@masonohioschools.com 211 North East Street, Mason, OH 45040 · website | |
| Member and OSBA Student Achievement Liaison (Mason City Schools) | Danni Tymitz | 2029 | (513) 295-3084 · tymitzd@masonohioschools.com 211 North East Street, Mason, OH 45040 · website |
Roster as of 2026-07-27: county board of elections.
Ballot issues
| Date | Issue | For | Against | Result |
|---|---|---|---|---|
| 2018-11-06 | Issue 4: 4 Mason City Charter Amendment Dwellings | 10,255 | 3,452 | Passed (74.82% for) |
| 2018-11-06 | Issue 5: 5 Mason City Charter Amendment Council | 5,847 | 6,901 | Failed (45.87% for) |
Elections for office
| Date | Office | Candidates and votes |
|---|---|---|
| 2017-11-07 | Member of Council | Diana K. Nelson 3,398, 20.83%; Ashley Chance 3,162, 19.39%; T.J. Honerlaw 2,809, 17.22%; Mike Gilb 2,353, 14.43%; Tony Bradburn 2,300, 14.1%; Josh Styrcula 2,288, 14.03% |
| 2015-11-03 | Member of Council | Barbara Berry-Spaeth 3,993, 22.41%; Kathy Grossmann 3,931, 22.06%; Victor L. Kidd 3,908, 21.93%; Tony Bradburn 2,765, 15.52%; Brad Glass 1,958, 10.99%; Rick Inskeep 1,264, 7.09% |
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 / 3 / 14; 2021 0 / 0 / 17; 2022 0 / 2 / 15; 2023 0 / 2 / 15; 2024 0 / 1 / 16; 2025 0 / 2 / 14.
- Financial Audit, 2024, released 2025-09-30
- Financial Audit, 2023, released 2024-08-08
The county
Warren County: 12 ZIP codes, 24 cities, villages and townships, 222,825 people.
Nearby places
Rain and snow
How much has actually fallen on Mason, day by day, from 1893 to now. Daily totals, not averages.
- rain, last 30 days
- 0.81 in
- 2026-09-30 to 2026-10-29
- rain so far in 2026
- 42.7 in
- 4.1 in above normal for the date
- snow so far in 2026
- 16.8 in
- a normal year brings 17.1 in
- a normal year
- 45.5 in
- average of 30 years, 1991-2020
| Month | Rain (in) | Snow (in) | Days counted |
|---|---|---|---|
| October 2026 | 0.81 | — | 29 |
| September 2026 | 6.17 | — | 30 |
| August 2026 | 6.40 | — | 31 |
| July 2026 | 3.33 | — | 31 |
| June 2026 | 4.80 | — | 30 |
| May 2026 | 6.92 | — | 31 |
| April 2026 | 3.74 | — | 30 |
| March 2026 | 7.52 | 0.2 | 31 |
| February 2026 | 1.34 | 4.7 | 28 |
| January 2026 | 1.65 | 11.9 | 31 |
| December 2025 | 2.60 | 11.2 | 31 |
| November 2025 | 3.33 | 1.1 | 30 |
| Wettest year | 2011 — 64.9 in |
|---|---|
| Driest year | 1934 — 21.7 in |
| Snowiest year | 1977 — 50.4 in |
| Wettest day on record | 6 October 1910 — 5.10 in |
| Heaviest snowfall in a day | 23 December 2004 — 12.07 in |
| Deepest snow on the ground | 20 January 1978 — 14.18 in |
Mostly estimated. Only 2% of these days come from a gauge standing inside Mason - the rest are worked out from the nearest gauges around it, so read them as close estimates rather than readings.
48,189 days of records, 1893-01-01 to 2026-10-29. 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 Mason: 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
- 66
- those placed on the map inside Mason
| Program | Facilities and sites |
|---|---|
| Hazardous waste | 19 |
| Wastewater and stormwater discharge | 18 |
| Air pollution | 9 |
| Sewer and water-line construction | 5 |
| Voluntary cleanup | 4 |
| Site assessment | 3 |
| Contaminated-site cleanup | 2 |
| Public drinking water | 2 |
| State sewer loans | 2 |
| Wetland and stream fill | 2 |
| Date | Facility or site | What |
|---|---|---|
| EAST MAIN PARKING LOT | Wastewater and stormwater discharge permit | |
| KINGS ISLAND PWS | Public drinking water compliance letter | |
| L3 HARRIS CINCINNATI ELECTRONICS | Hazardous waste notice of violation | |
| KINGS ISLAND PWS | Public drinking water inspection | |
| KINGS ISLAND PWS | Public drinking water compliance letter | |
| PETERMANN LTD | Wastewater and stormwater discharge permit | |
| KINGS ISLAND PWS | Public drinking water inspection | |
| KINGS ISLAND PWS | Public drinking water compliance letter | |
| WELDEN DRIVE OFFICE/WAREHOUSE BUILDING | Wastewater and stormwater discharge permit | |
| MAUSER-USA | Air pollution violation resolved | |
| NOUVEAU PHASE 2 & 3 | Sewer and water-line construction permit | |
| NOUVEAU PHASE 2 & 3 | Sewer and water-line construction permit | |
| NOUVEAU PHASE 2 & 3 | Sewer and water-line construction permit | |
| DEERFIELD MFG CO FORMER, MASON | Voluntary cleanup inspection | |
| REBER AUTO & BODY REPAIR INC | Air pollution report | |
| L3 HARRIS CINCINNATI ELECTRONICS | Air pollution report | |
| HAAG-STREIT USA | Air pollution report | |
| DEERFIELD MFG CO FORMER, MASON | Voluntary cleanup inspection | |
| KINGS ISLAND PWS | Public drinking water withdrawn | |
| KINGS ISLAND PWS | Public drinking water compliance letter | |
| KINGS ISLAND PWS | Public drinking water notice of violation | |
| LINDNER FAMILY TENNIS CENTER | Wastewater and stormwater discharge permit | |
| NOUVEAU PHASE 2 & 3 | Wastewater and stormwater discharge inspection | |
| NOUVEAU | Wastewater and stormwater discharge inspection | |
| EVERYBODY'S FARM PHASE II | Wastewater and stormwater discharge inspection |
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 county is Mason, Ohio in?
Mason is a city in Warren County, Ohio, with 34,795 residents.
When was Mason, Ohio founded?
Mason was settled 1803; laid out 1815; incorporated 1839 (as a village, effective March 1840); 1971 (as a home-rule city). Founders on record: William Mason, a Revolutionary War veteran who purchased the 640-acre site at auction on June 1, 1803. Source
How did Mason, Ohio get its name?
William Mason platted 16 lots on his land in 1815 and named the settlement 'Palmira' (also spelled Palmyra). Source
What ZIP code is Mason, Ohio?
Mason is served by ZIP codes 45040 and 45036; 45040 holds the largest share of its residents.
Where does Mason, Ohio get its water?
The main water source for Mason (Cincinnati Public Water System): Ohio River intake at the plant's riverfront on Kellogg Ave in the California neighborhood, east Cincinnati.
Cite this page
Cite this page as:
Cracked Buckeye, "Mason, Warren County", https://crackedbuckeye.com/place/mason/, built 2026-10-31, accessed [date].
How to cite · Report a correction · Built 2026-10-31
