Identifiers: city · CDP · village
| Rank | Community | Population |
|---|---|---|
| 1 | Mount Vernon (city), OH | 16,956 |
| 2 | Apple Valley (CDP), OH | 5,352 |
| 3 | Loudonville (village), OH | 2,786 |
| 4 | Fredericktown (village), OH | 2,648 |
| 5 | Gambier (village), OH | 2,213 |
| 6 | Utica (village), OH | 2,064 |
| 7 | Bellville (village), OH | 1,963 |
| 8 | Centerburg (village), OH | 1,690 |
| 9 | Danville (village), OH | 1,019 |
| 10 | South Mount Vernon (CDP), OH | 714 |
| 11 | St. Louisville (village), OH | 352 |
| 12 | Howard (CDP), OH | 246 |
| 13 | Martinsburg (village), OH | 222 |
| 14 | Chesterville (village), OH | 191 |
| 15 | Bladensburg (CDP), OH | 180 |
| 16 | Nellie (village), OH | 122 |
| 17 | Sparta (village), OH | 121 |
| 18 | Brinkhaven (village), OH | 0 |