| City | County | 2025 Pop. ↓ |
|---|---|---|
| Toledo | Lucas County | 261,989 |
| Troy | Miami County | 27,163 |
| Trotwood | Darke County | 22,849 |
| Twinsburg | Summit County | 19,561 |
| Tallmadge | Summit County | 18,256 |
| Tiffin | Seneca County | 17,360 |
| Trenton | Butler County | 14,215 |
| Tipp City | Miami County | 10,608 |
| Turpin Hills | Hamilton County | 6,014 |
| The Village Indian Hill | Clermont County | 5,974 |
| Toronto | Jefferson County | 5,118 |
| Taylor Creek | Hamilton County | 4,217 |
| The Plains | Athens County | 2,635 |
| Terrace Park | Hamilton County | 2,304 |
| Tiltonsville | Jefferson County | 1,204 |
| Thornville | Perry County | 1,097 |
| Thornport | Fairfield County | 1,049 |
| Tuscarawas | Tuscarawas County | 1,020 |
| Twinsburg Heights | Summit County | 969 |
| Thurston | Fairfield County | 603 |
| Timberlake | Lake County | 601 |
| Tuppers Plains | Meigs County | 444 |
| Tontogany | Wood County | 388 |
| Tremont City | Clark County | 341 |
| Trimble | Athens County | 320 |
| Tarlton | Pickaway County | 270 |
| Tedrow | Fulton County | 269 |
| Tiro | Crawford County | 213 |
| Trinway | Muskingum County | 184 |
| Tippecanoe | Harrison County | 91 |