| City | County | 2025 Pop. ↓ |
|---|---|---|
| Jackson | Jackson County | 6,173 |
| Johnstown | Licking County | 5,390 |
| Jefferson | Ashtabula County | 3,162 |
| Jamestown | Greene County | 2,088 |
| Jackson Center | Shelby County | 1,426 |
| Jeffersonville | Fayette County | 1,234 |
| Jacksonburg | Butler County | 1,097 |
| Junction City | Perry County | 718 |
| Jewett | Harrison County | 529 |
| Jeromesville | Ashland County | 522 |
| Jerry City | Wood County | 454 |
| Jersey | Fairfield County | 424 |
| Jacksonville | Athens County | 390 |
| Jacksontown | Licking County | 265 |
| Jenera | Hancock County | 243 |
| Jerusalem | Monroe County | 120 |