Identifiers: city · village · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Sidney (city), OH | 20,589 |
| 2 | Celina (city), OH | 10,935 |
| 3 | Wapakoneta (city), OH | 9,957 |
| 4 | St. Marys (city), OH | 8,397 |
| 5 | Minster (village), OH | 3,046 |
| 6 | New Bremen (village), OH | 3,034 |
| 7 | Cridersville (village), OH | 1,791 |
| 8 | Fort Loramie (village), OH | 1,590 |
| 9 | Anna (village), OH | 1,470 |
| 10 | Jackson Center (village), OH | 1,441 |
| 11 | Botkins (village), OH | 1,155 |
| 12 | Maria Stein (CDP), OH | 1,067 |
| 13 | New Knoxville (village), OH | 946 |
| 14 | Chickasaw (village), OH | 358 |
| 15 | Buckland (village), OH | 233 |
| 16 | Uniopolis (CDP), OH | 188 |
| 17 | St. Johns (CDP), OH | 181 |
| 18 | Kettlersville (village), OH | 164 |
| 19 | Montezuma (village), OH | 152 |