| City | County | 2026 Pop. ↓ |
|---|---|---|
| Toledo | Lucas County | 261,949 |
| Troy | Miami County | 27,530 |
| Trotwood | Darke County | 23,188 |
| Twinsburg | Summit County | 18,865 |
| Tallmadge | Summit County | 18,540 |
| Tiffin | Seneca County | 17,750 |
| Trenton | Butler County | 14,488 |
| Tipp City | Miami County | 10,713 |
| The Village of Indian Hill | Clermont County | 6,118 |
| Turpin Hills | Hamilton County | 5,365 |
| Toronto | Jefferson County | 5,121 |
| Taylor Creek | Hamilton County | 4,221 |
| The Plains | Athens County | 2,470 |
| Terrace Park | Hamilton County | 2,357 |
| Tiltonsville | Jefferson County | 1,206 |
| Thornport | Fairfield County | 1,192 |
| Twinsburg Heights | Summit County | 1,118 |
| Thornville | Perry County | 1,113 |
| Tuscarawas | Tuscarawas County | 1,008 |
| Thurston | Fairfield County | 617 |
| Timberlake | Lake County | 598 |
| Tuppers Plains | Meigs County | 506 |
| Tontogany | Wood County | 390 |
| Tremont City | Clark County | 345 |
| Trimble | Athens County | 323 |
| Tarlton | Pickaway County | 271 |
| Tedrow | Fulton County | 255 |
| Tiro | Crawford County | 217 |
| Trinway | Muskingum County | 177 |