Williams County, Ohio
County seat: Bryan · Population 36,549 (2025) · 421 sq mi
Williams County is the 67th most populous of Ohio's 88 counties, with 36,549 people (2025 estimate). Its county seat is Bryan. The map shows its 9 cities and towns and the 6 neighboring counties.
Williams County facts
- County seat
- Bryan
- Population (2025 estimate)
- 36,549 −1.5% since 2020
- Land area
- 421 sq mi 53rd largest of 88
- Water area
- 2 sq mi
- Population density
- 87 per sq mi
- Established
- 1820
- Named after
- David Williams militiaman from the state of New York during the American Revolution
- Largest city
- Bryan 8,579
- Median household income
- $61,048
- Cities and towns
- 9 plus 5 CDPs
- ZIP codes
- 12
- Time zone
- Eastern
- FIPS code
- 39171
Cities and towns in Williams County
Williams County has 9 incorporated cities, towns and villages. Populations count the people living inside Williams County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Bryan (county seat) | City | 8,579 | |
| Montpelier | Village | 3,884 | |
| Edgerton | Village | 1,882 | |
| West Unity | Village | 1,735 | |
| Pioneer | Village | 1,419 | |
| Stryker | Village | 1,239 | |
| Edon | Village | 784 | |
| Blakeslee | Village | 105 | |
| Holiday City | Village | 47 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Lake Seneca | 532 | |
| Kunkle | 244 | |
| Alvordton | 190 | |
| Nettle Lake | 180 | |
| Pulaski | 87 |
ZIP codes in Williams County
12 ZIP codes reach into Williams County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 43501
- 43502 also Fulton and Henry counties
- 43505
- 43506 also Defiance County
- 43517 also Defiance County
- 43518
- 43521 also Fulton County
- 43531
- 43543
- 43554
- 43557 also Henry and Fulton counties
- 43570 also Fulton County
Population of Williams County, 2020–2025
Williams County shrank by 557 people (−1.5%) between April 2020 and July 2025: 322 more deaths than births and a net loss of 221 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 37,084 |
| 2021 | 36,792 |
| 2022 | 36,642 |
| 2023 | 36,626 |
| 2024 | 36,621 |
| 2025 | 36,549 |
Neighboring counties
- Defiance County south · 38,292 people
- Hillsdale County, Michigan north · 45,738 people
- Fulton County east · 41,853 people
- Steuben County, Indiana west · 34,799 people
- DeKalb County, Indiana southwest · 44,535 people
- Henry County southeast · 27,598 people
Printable Williams 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) (87 KB)
- PNG (2400 px) (63 KB)
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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.
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