8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Washington Court House | 1 | 14,447 | 14,442 | 0.01% | 1,619 | 9 | City |
| Union | 2 | 3,544 | 3,620 | -0.59% | 73 | 49 | Township |
| Paint | 3 | 1,797 | 1,831 | -0.55% | 35 | 52 | Township |
| Jeffersonville | 4 | 1,231 | 1,254 | -0.4% | 512 | 2 | Village |
| Concord | 5 | 965 | 985 | -0.52% | 34 | 29 | Township |
| Bloomingburg | 6 | 863 | 880 | -0.46% | 1,260 | 1 | Village |
| Milledgeville | 7 | 98 | 101 | -1.01% | 980 | 0 | Village |
| Octa | 8 | 57 | 56 | 0% | 197 | 0 | Village |
Washington Court House is the largest city in Fayette County, with a population of 14,447.
Octa is the smallest city in Fayette County, with a population of 57.
There are 8 cities in Fayette County, Ohio.