Adams County, Ohio
County seat: West Union · Population 27,865 (2025) · 584 sq mi
Adams County is the 76th most populous of Ohio's 88 counties, with 27,865 people (2025 estimate). Its county seat is West Union. The map shows its 5 cities and towns and the 6 neighboring counties.
Adams County facts
- County seat
- West Union
- Population (2025 estimate)
- 27,865 +1.4% since 2020
- Land area
- 584 sq mi 10th largest of 88
- Water area
- 2 sq mi
- Population density
- 48 per sq mi
- Established
- 1797
- Named after
- John Adams Founding Father, U.S. president from 1797 to 1801 (1735–1826)
- Largest city
- West Union 3,091
- Median household income
- $50,264
- Cities and towns
- 5 plus 3 CDPs
- ZIP codes
- 13
- Time zone
- Eastern
- FIPS code
- 39001
Cities and towns in Adams County
Adams County has 5 incorporated cities, towns and villages. Populations count the people living inside Adams County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| West Union (county seat) | Village | 3,091 | |
| Manchester | Village | 1,874 | |
| Peebles | Village | 1,777 | |
| Winchester | Village | 998 | |
| Seaman | Village | 988 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Bentonville | 277 | |
| Cherry Fork | 61 | |
| Rome | 55 |
ZIP codes in Adams County
13 ZIP codes reach into Adams County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 45101 also Brown County
- 45105
- 45144 also Brown County
- 45616 also Scioto County
- 45618
- 45650
- 45657 also Scioto and Pike counties
- 45660 also Pike, Highland and Scioto counties
- 45671 also Scioto and Pike counties
- 45679 also Highland County
- 45684 also Scioto County
- 45693
- 45697 also Brown and Highland counties
Population of Adams County, 2020–2025
Adams County grew by 384 people (+1.4%) between April 2020 and July 2025: 477 more deaths than births and a net gain of 864 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 27,451 |
| 2021 | 27,581 |
| 2022 | 27,412 |
| 2023 | 27,512 |
| 2024 | 27,642 |
| 2025 | 27,865 |
Neighboring counties
- Scioto County east · 71,365 people
- Lewis County, Kentucky south · 12,901 people
- Brown County west · 44,397 people
- Highland County north · 43,823 people
- Pike County northeast · 27,061 people
- Mason County, Kentucky southwest · 16,936 people
Printable Adams 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) (89 KB)
- PNG (2400 px) (86 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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