| City | County | 2026 Pop. ↓ |
|---|---|---|
| Jackson | Jackson County | 6,227 |
| Johnstown | Licking County | 5,532 |
| Jefferson | Ashtabula County | 3,135 |
| Jamestown | Greene County | 2,134 |
| Jackson Center | Shelby County | 1,446 |
| Jeffersonville | Fayette County | 1,240 |
| Junction City | Perry County | 721 |
| Jewett | Harrison County | 529 |
| Jeromesville | Ashland County | 527 |
| Jerry City | Wood County | 459 |
| Jersey | Fairfield County | 438 |
| Jacksonville | Athens County | 382 |
| Jacksontown | Licking County | 319 |
| Jenera | Hancock County | 239 |
| Jerusalem | Monroe County | 129 |
| Jacksonburg | Butler County | 53 |