30 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Toledo | Lucas County | 264,476 |
| Troy | Miami County | 27,306 |
| Trotwood | Darke County | 23,071 |
| Twinsburg | Summit County | 19,564 |
| Tallmadge | Summit County | 18,412 |
| Tiffin | Seneca County | 17,652 |
| Trenton | Butler County | 14,395 |
| Tipp City | Miami County | 10,669 |
| The Village Indian Hill | Clermont County | 6,092 |
| Turpin Hills | Hamilton County | 6,014 |
| Toronto | Jefferson County | 5,158 |
| Taylor Creek | Hamilton County | 4,217 |
| The Plains | Athens County | 2,635 |
| Terrace Park | Hamilton County | 2,349 |
| Tiltonsville | Jefferson County | 1,211 |
| Thornville | Perry County | 1,095 |
| Thornport | Fairfield County | 1,049 |
| Tuscarawas | Tuscarawas County | 1,018 |
| Twinsburg Heights | Summit County | 969 |
| Thurston | Fairfield County | 610 |
| Timberlake | Lake County | 605 |
| Tuppers Plains | Meigs County | 444 |
| Tontogany | Wood County | 388 |
| Tremont City | Clark County | 344 |
| Trimble | Athens County | 329 |
| Tedrow | Fulton County | 269 |
| Tarlton | Pickaway County | 268 |
| Tiro | Crawford County | 216 |
| Trinway | Muskingum County | 184 |
| Tippecanoe | Harrison County | 91 |