Identifiers: city · village · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Delaware (city), OH | 41,302 |
| 2 | Marion (city), OH | 35,999 |
| 3 | Bucyrus (city), OH | 11,684 |
| 4 | Upper Sandusky (city), OH | 6,698 |
| 5 | Mount Gilead (village), OH | 3,503 |
| 6 | Richwood (village), OH | 2,222 |
| 7 | Cardington (village), OH | 2,079 |
| 8 | Ashley (village), OH | 1,198 |
| 9 | Prospect (village), OH | 1,067 |
| 10 | Nevada (village), OH | 706 |
| 11 | La Rue (village), OH | 676 |
| 12 | Caledonia (village), OH | 560 |
| 13 | Iberia (CDP), OH | 431 |
| 14 | Edison (village), OH | 422 |
| 15 | New Bloomington (village), OH | 413 |
| 16 | Morral (village), OH | 373 |
| 17 | Waldo (village), OH | 326 |
| 18 | Green Camp (village), OH | 310 |
| 19 | Marengo (village), OH | 283 |
| 20 | Fulton (village), OH | 250 |
Identifiers: city · village · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Delaware (city), OH | 41,302 |
| 2 | Marion (city), OH | 35,999 |
| 3 | Bucyrus (city), OH | 11,684 |
| 4 | Upper Sandusky (city), OH | 6,698 |
| 5 | Mount Gilead (village), OH | 3,503 |
| 6 | Richwood (village), OH | 2,222 |
| 7 | Cardington (village), OH | 2,079 |
| 8 | Ashley (village), OH | 1,198 |
| 9 | Prospect (village), OH | 1,067 |
| 10 | Nevada (village), OH | 706 |
| 11 | La Rue (village), OH | 676 |
| 12 | Caledonia (village), OH | 560 |
| 13 | Iberia (CDP), OH | 431 |
| 14 | Edison (village), OH | 422 |
| 15 | New Bloomington (village), OH | 413 |
| 16 | Morral (village), OH | 373 |
| 17 | Waldo (village), OH | 326 |
| 18 | Green Camp (village), OH | 310 |
| 19 | Marengo (village), OH | 283 |
| 20 | Fulton (village), OH | 250 |