| City | County | 2025 Pop. ↓ |
|---|---|---|
| Kettering | Montgomery County | 56,240 |
| Kent | Portage County | 27,216 |
| Kenwood | Hamilton County | 8,614 |
| Kenton | Hardin County | 7,764 |
| Kirtland | Geauga County | 6,868 |
| Kalida | Putnam County | 1,448 |
| Kingston | Ross County | 1,234 |
| Kings Mills | Warren County | 1,119 |
| Kidron | Wayne County | 1,015 |
| Kingsville | Ashtabula County | 921 |
| Kinsman Center | Ashtabula County | 872 |
| Killbuck | Holmes County | 803 |
| Kirtland Hills | Geauga County | 687 |
| Kirkersville | Licking County | 483 |
| Kanauga | Gallia County | 302 |
| Kelleys Island | Erie County | 259 |
| Kunkle | Williams County | 217 |
| Kipton | Lorain County | 205 |
| Kansas | Seneca County | 185 |
| Kettlersville | Shelby County | 157 |
| Kimbolton | Guernsey County | 126 |
| Kirby | Wyandot County | 111 |