10 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Washington Court House | 1 | 14,394 | 14,438 | -0.06% | 1,613 | 8.93 | City |
| Union township | 2 | 3,571 | 3,621 | -0.2% | 73 | 48.73 | Township |
| Paint township | 3 | 1,815 | 1,830 | 0% | 35 | 51.55 | Township |
| Jeffersonville | 4 | 1,234 | 1,254 | -0.32% | 727 | 1.70 | Village |
| Concord township | 5 | 973 | 987 | -0.21% | 34 | 28.70 | Township |
| Bloomingburg | 6 | 868 | 878 | -0.23% | 1,267 | 0.69 | Village |
| Good Hope | 7 | 267 | 231 | 1.14% | 355 | 0.75 | CDP |
| Milledgeville | 8 | 100 | 102 | 0% | 1,000 | 0.10 | Village |
| Pancoastburg | 9 | 81 | 43 | 6.58% | 238 | 0.34 | CDP |
| Octa | 10 | 58 | 57 | 0% | 200 | 0.29 | 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.
There are 10 cities in Fayette County, Ohio.