23 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Kettering | Montgomery County | 56,829 |
| Kent | Portage County | 27,606 |
| Kenwood | Hamilton County | 8,715 |
| Kenton | Hardin County | 7,832 |
| Kirtland | Geauga County | 6,908 |
| Kalida | Putnam County | 1,449 |
| Kingston | Ross County | 1,230 |
| Kings Mills | Warren County | 1,043 |
| Kidron | Wayne County | 845 |
| Killbuck | Holmes County | 813 |
| Kinsman Center | Ashtabula County | 805 |
| Kingsville | Ashtabula County | 696 |
| Kirtland Hills | Geauga County | 691 |
| Kirkersville | Licking County | 481 |
| Kanauga | Gallia County | 292 |
| Kunkle | Williams County | 266 |
| Kelleys Island | Erie County | 261 |
| Kipton | Lorain County | 208 |
| Kansas | Seneca County | 174 |
| Kettlersville | Shelby County | 163 |
| Kirby | Wyandot County | 113 |
| Kimbolton | Guernsey County | 68 |
| Kilbourne | Delaware County | 1 |