15 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Meigs | 1 | 3,797 | 3,787 | 0.21% | 61 | 63 | Township |
| West Union | 2 | 3,129 | 3,006 | 0.68% | 1,105 | 3 | Village |
| Winchester | 3 | 2,277 | 2,220 | 0.93% | 70 | 33 | Township |
| Liberty | 4 | 2,111 | 2,073 | 0.38% | 49 | 43 | Township |
| Manchester | 5 | 1,914 | 1,883 | 0.37% | 796 | 2 | Township |
| Manchester | 6 | 1,866 | 1,841 | 0.21% | 1,473 | 1 | Village |
| Sprigg | 7 | 1,764 | 1,752 | 0.23% | 40 | 44 | Township |
| Peebles | 8 | 1,755 | 1,770 | -0.11% | 1,446 | 1 | Village |
| Bratton | 9 | 1,379 | 1,381 | 0.07% | 43 | 32 | Township |
| Oliver | 10 | 1,350 | 1,344 | 0.3% | 47 | 29 | Township |
| Brush Creek | 11 | 1,098 | 1,096 | 0.09% | 26 | 41 | Township |
| Winchester | 12 | 1,004 | 985 | 0.3% | 384 | 3 | Village |
| Seaman | 13 | 969 | 972 | 0% | 908 | 1 | Village |
| Blue Creek | 14 | 698 | 706 | 0% | 19 | 36 | Township |
| Manchester | 15 | 117 | 122 | -0.85% | 6 | 18 | Township |
Meigs is the largest city in Adams County, with a population of 3,797.
Manchester is the smallest city in Adams County, with a population of 117.
There are 15 cities in Adams County, Ohio.