13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sandersville | 1 | 5,429 | 5,812 | -1.29% | 422 | 13 | City |
| Sandersville | 2 | 5,429 | 5,782 | -1.29% | 422 | 13 | City |
| Davisboro | 3 | 1,973 | 1,838 | 1.39% | 647 | 3 | City |
| Davisboro | 4 | 1,973 | 1,836 | 1.39% | 647 | 3 | City |
| Tennille | 5 | 1,923 | 1,501 | 4.17% | 1,170 | 2 | City |
| Tennille | 6 | 1,923 | 1,537 | 4.17% | 1,170 | 2 | City |
| Harrison | 7 | 320 | 340 | -1.23% | 187 | 2 | Town |
| Harrison | 8 | 320 | 338 | -1.23% | 187 | 2 | Town |
| Warthen | 9 | 197 | 148 | 7.07% | 623 | 0 | CDP |
| Oconee | 10 | 181 | 190 | -1.09% | 139 | 1 | City |
| Oconee | 11 | 181 | 189 | -1.09% | 139 | 1 | City |
| Riddleville | 12 | 78 | 82 | -1.27% | 102 | 1 | Town |
| Riddleville | 13 | 78 | 82 | -1.27% | 102 | 1 | Town |
Sandersville is the largest city in Washington County, with a population of 5,429.
Riddleville is the smallest city in Washington County, with a population of 78.
There are 13 cities in Washington County, Georgia.