Butler County, Ohio
County seat: Hamilton · Population 400,128 (2025) · 467 sq mi
Butler County is the 7th most populous of Ohio's 88 counties, with 400,128 people (2025 estimate). Its county seat is Hamilton. The map shows its 12 cities and towns and the 7 neighboring counties.
Butler County facts
- County seat
- Hamilton
- Population (2025 estimate)
- 400,128 +2.5% since 2020
- Land area
- 467 sq mi 34th largest of 88
- Water area
- 4 sq mi
- Population density
- 858 per sq mi
- Established
- 1803
- Named after
- Richard Butler United States general (1743-1791)
- Largest city
- Hamilton 64,644
- Median household income
- $81,590
- Cities and towns
- 12 plus 9 CDPs
- ZIP codes
- 18
- Time zone
- Eastern
- FIPS code
- 39017
Cities and towns in Butler County
Butler County has 12 incorporated cities, towns and villages. Populations count the people living inside Butler County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Hamilton (county seat) | City | 64,644 | |
| Middletown | City | 48,152 | Warren County |
| Fairfield | City | 44,682 | Hamilton County |
| Oxford | City | 22,387 | |
| Monroe | City | 15,757 | Warren County |
| Trenton | City | 14,241 | |
| Sharonville | City | 2,557 | Hamilton County |
| New Miami | Village | 2,287 | |
| Seven Mile | Village | 737 | |
| Millville | Village | 642 | |
| College Corner | Village | 151 | Preble County |
| Jacksonburg | Village | 53 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Beckett Ridge | 9,496 | |
| Four Bridges | 3,417 | |
| Ross | 2,601 | |
| Wetherington | 1,138 | |
| Williamsdale | 802 | |
| Woodsdale | 735 | |
| Darrtown | 643 | |
| Olde West Chester | 291 | |
| Somerville | 208 |
ZIP codes in Butler County
18 ZIP codes reach into Butler County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 45003 also Preble County
- 45011
- 45013 also Hamilton County
- 45014
- 45015
- 45042 also Preble, Montgomery and Warren counties
- 45044 also Warren County
- 45050 also Warren County
- 45053
- 45055
- 45056
- 45062
- 45064 also Preble County
- 45067
- 45069 also Hamilton County
- 45241 also Hamilton and Warren counties
- 45246 also Hamilton County
- 45327 also Montgomery, Preble and Warren counties
Population of Butler County, 2020–2025
Butler County grew by 9,783 people (+2.5%) between April 2020 and July 2025: 1,647 more births than deaths and a net gain of 8,392 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 390,845 |
| 2021 | 387,409 |
| 2022 | 390,108 |
| 2023 | 394,636 |
| 2024 | 397,781 |
| 2025 | 400,128 |
Neighboring counties
- Hamilton County south · 838,418 people
- Warren County east · 257,181 people
- Preble County north · 40,664 people
- Franklin County, Indiana west · 23,286 people
- Montgomery County northeast · 539,598 people
- Union County, Indiana northwest · 6,863 people
- Dearborn County, Indiana southwest · 51,609 people
Printable Butler County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (120 KB)
- PNG (2400 px) (83 KB)
Paste this code to embed the map on your site:
Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
Back to the Ohio county map with all 88 counties. Found an error? Tell us.