Mason is a city in Warren County, Ohio, home to about 35,509 people across 19 square miles. Its ZIP code is 45040, and parts of 45036 and 45039 are in Mason too.
Homes sold for a median of $209 per square foot in the three months ending August 2026, a seller’s market.
Mostly Mason; also Landen and Kings Mills
Mostly Lebanon; part is in Mason
Part is in Mason, part in Landen and Maineville
Each card is that ZIP code’s whole market, including any part outside Mason. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Mason’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Cincinnati Northern Kentucky International Airport (CVG)28 miles away |
|---|---|
| Closer regional airport | Cincinnati Municipal Airport Lunken Field (LUK)18 miles away |
| Nearest city of 250,000+ | Cincinnati, OH18 miles away |
| Nearest city of 1 million+ | Chicago, IL247 miles away |
Straight-line distances from the center of Mason; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Mason had 34,792 residents in the 2020 census, up 58% since 2000.
It’s the 39th largest of 1,264 towns in Ohio by population.
Warren County grew from 25,584 residents in 1900 to 242,337 in 2020.
Warren County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 87°F in summer, and winter lows average 22°F. About 41.5 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Hamilton Butler Co Rgnl Ap, OH weather station (12 miles away).
82,752 jobs at 4,826 businesses in Warren County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
729 doctors and other health care providers list an office in Mason.
Nearest hospitals
Providers with an office here
| Primary care doctors | 95 |
|---|---|
| Specialist doctors | 43 |
| Dentists | 45 |
| Nurse practitioners and physician assistants | 128 |
| Mental health providers | 273 |
| Physical and occupational therapists | 109 |
| Optometrists | 13 |
| Chiropractors | 23 |
| Pharmacies | 22 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (13 nearby)
Grocery stores (5 nearby)
Pharmacies (6 nearby)
Libraries (1 nearby)
Museums (3 nearby)
Theaters and performance venues (9 nearby)
Counts are within about 3 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Established in 1815.
Notable people born here
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by Mason City. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Mason Early Childhood Center Elementary SchoolMason | Pre-K–2 | 1,997 | Public | 2.3 mi |
| Mason Intermediate Elementary SchoolMason | 3–6 | 3,086 | Public | 0.6 mi |
| Mason Middle SchoolMason | 7–8 | 1,637 | Public | 0.3 mi |
| William Mason High SchoolMason | 9–12 | 3,435 | Public | 0.7 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| King of Kings Preschool and KindergartenMason | Pre-K–K | 11 | Lutheran Church–Missouri Synod | 1.7 mi |
| Liberty Bible AcademyMason | Pre-K–12 | 310 | Christian (no specific denomination) | 2.3 mi |
| Montessori Academy of CincinnatiMason | Pre-K–8 | 158 | Nonsectarian | 1.8 mi |
| Montessori Academy of CincinnatiMason | Pre-K–8 | 158 | Nonsectarian | 1.8 mi |
| Royalmont AcademyMason | Pre-K–12 | 147 | Roman Catholic | 1.3 mi |
| The Goddard School - Mason IMason | Pre-K–K | 10 | Nonsectarian | 1.2 mi |
| Chai Tots Montessori SchoolMason | K | 4 | Jewish | 1.2 mi |
| Primrose School of MasonMason | K | 17 | Nonsectarian | 1.6 mi |
| St Susanna Elementary SchoolMason | K–8 | 628 | Roman Catholic | 1.2 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Lebanon, Landen, Monroe, South Lebanon, Maineville and Kings Mills.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.