30 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Violet | 1 | 52,327 | 46,021 | 2% | 1,258 | 42 | Township |
| Lancaster | 2 | 42,191 | 40,631 | 0.62% | 2,215 | 19 | City |
| Pickerington | 3 | 27,101 | 23,240 | 2.43% | 2,658 | 10 | City |
| Bloom | 4 | 11,752 | 10,229 | 2.05% | 316 | 37 | Township |
| Liberty | 5 | 8,800 | 8,255 | 1.3% | 175 | 50 | Township |
| Walnut | 6 | 7,014 | 6,693 | 1.04% | 146 | 48 | Township |
| Pleasant | 7 | 6,532 | 6,195 | 1.13% | 189 | 35 | Township |
| Berne | 8 | 5,234 | 5,069 | 0.77% | 119 | 44 | Township |
| Hocking | 9 | 4,996 | 4,852 | 0.52% | 152 | 33 | Township |
| South Bloomfield | 10 | 4,546 | 2,149 | 9.65% | 1,137 | 4 | Village |
| Rush Creek | 11 | 4,197 | 3,980 | 1.01% | 113 | 37 | Township |
| Clearcreek | 12 | 4,188 | 4,125 | 0.48% | 115 | 36 | Township |
| Lithopolis | 13 | 3,197 | 2,182 | 5.58% | 1,411 | 2 | Village |
| Baltimore | 14 | 3,112 | 3,042 | 0.39% | 1,318 | 2 | Village |
| Amanda | 15 | 2,775 | 2,687 | 0.54% | 75 | 37 | Township |
| Richland | 16 | 2,414 | 2,340 | 0.71% | 98 | 25 | Township |
| Carroll | 17 | 2,064 | 2,107 | -0.29% | 61 | 34 | Township |
| Amanda | 18 | 2,049 | 2,069 | 0% | 62 | 33 | Township |
| Bremen | 19 | 1,534 | 1,492 | 0.46% | 1,782 | 1 | Village |
| Amanda | 20 | 1,052 | 1,065 | 0% | 38 | 28 | Township |
| Millersport | 21 | 1,000 | 979 | 0.4% | 1,075 | 1 | Village |
| Pleasantville | 22 | 959 | 944 | 0.31% | 3,539 | 0 | Village |
| Amanda | 23 | 684 | 666 | 0.44% | 2,158 | 0 | Village |
| Thurston | 24 | 611 | 608 | 0.16% | 1,512 | 0 | Village |
| Stoutsville | 25 | 580 | 580 | 0% | 502 | 1 | Village |
| Carroll | 26 | 500 | 502 | 0% | 795 | 1 | Village |
| Sugar Grove | 27 | 407 | 410 | 0% | 1,326 | 0 | Village |
| Rushville | 28 | 305 | 305 | 0% | 1,271 | 0 | Village |
| Darbyville | 29 | 190 | 186 | 0.53% | 368 | 1 | Village |
| West Rushville | 30 | 163 | 165 | 0% | 2,508 | 0 | Village |
Violet is the largest city in Fairfield County, with a population of 52,327.
West Rushville is the smallest city in Fairfield County, with a population of 163.
There are 30 cities in Fairfield County, Ohio.