10 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Washington Court House | 1 | 14,394 | 14,438 | -0.06% | 1,613 | 9 | City |
| Union | 2 | 3,571 | 3,621 | -0.2% | 73 | 49 | Township |
| Paint | 3 | 1,815 | 1,830 | 0% | 35 | 52 | Township |
| Jeffersonville | 4 | 1,234 | 1,254 | -0.32% | 727 | 2 | Village |
| Concord | 5 | 973 | 987 | -0.21% | 34 | 29 | Township |
| Bloomingburg | 6 | 868 | 878 | -0.23% | 1,267 | 1 | Village |
| Good Hope | 7 | 267 | 231 | 1.14% | 355 | 1 | CDP |
| Milledgeville | 8 | 100 | 102 | 0% | 1,000 | 0 | Village |
| Pancoastburg | 9 | 81 | 43 | 6.58% | 238 | 0 | CDP |
| Octa | 10 | 58 | 57 | 0% | 200 | 0 | Village |
Washington Court House is the largest city in Fayette County, with a population of 14,394.
Octa is the smallest city in Fayette County, with a population of 58.
There are 10 cities in Fayette County, Ohio.