| City | County | 2026 Pop. ↓ |
|---|---|---|
| Kettering | Montgomery County | 57,257 |
| Kent | Portage County | 27,596 |
| Kenwood | Hamilton County | 8,831 |
| Kenton | Hardin County | 7,783 |
| Kirtland | Geauga County | 6,926 |
| Kalida | Putnam County | 1,479 |
| Kingston | Ross County | 1,231 |
| Kings Mills | Warren County | 1,025 |
| Kidron | Wayne County | 838 |
| Kinsman Center | Ashtabula County | 818 |
| Killbuck | Holmes County | 817 |
| Kingsville | Ashtabula County | 742 |
| Kirtland Hills | Geauga County | 688 |
| Kirkersville | Licking County | 488 |
| Kanauga | Gallia County | 299 |
| Kunkle | Williams County | 267 |
| Kelleys Island | Erie County | 264 |
| Kipton | Lorain County | 205 |
| Kansas | Seneca County | 174 |
| Kettlersville | Shelby County | 174 |
| Kirby | Wyandot County | 115 |
| Kimbolton | Guernsey County | 63 |