5 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| West Union | 1 | 3,129 | 3,006 | 0.68% | 1,105 | 3 | Village |
| Manchester | 2 | 1,866 | 1,841 | 0.21% | 1,473 | 1 | Village |
| Peebles | 3 | 1,755 | 1,770 | -0.11% | 1,446 | 1 | Village |
| Winchester | 4 | 1,004 | 985 | 0.3% | 384 | 3 | Village |
| Seaman | 5 | 969 | 972 | 0% | 908 | 1 | Village |
West Union is the largest city in Adams County, with a population of 3,129.
Seaman is the smallest city in Adams County, with a population of 969.
There are 5 cities in Adams County, Ohio.