Identifiers: city · village · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Mansfield (city), OH | 47,534 |
| 2 | Marion (city), OH | 35,999 |
| 3 | Bucyrus (city), OH | 11,684 |
| 4 | Galion (city), OH | 10,453 |
| 5 | Shelby (city), OH | 9,282 |
| 6 | Upper Sandusky (city), OH | 6,698 |
| 7 | Ontario (city), OH | 6,656 |
| 8 | Crestline (village), OH | 4,525 |
| 9 | Roseland (CDP), OH | 1,495 |
| 10 | Attica (village), OH | 873 |
| 11 | New Washington (village), OH | 873 |
| 12 | Nevada (village), OH | 706 |
| 13 | Caledonia (village), OH | 560 |
| 14 | Iberia (CDP), OH | 431 |
| 15 | Morral (village), OH | 373 |
| 16 | North Robinson (village), OH | 219 |
| 17 | Tiro (village), OH | 219 |
| 18 | Chatfield (village), OH | 205 |
| 19 | Sulphur Springs (CDP), OH | 197 |
| 20 | Harpster (village), OH | 160 |
Identifiers: city · village · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Mansfield (city), OH | 47,534 |
| 2 | Marion (city), OH | 35,999 |
| 3 | Bucyrus (city), OH | 11,684 |
| 4 | Galion (city), OH | 10,453 |
| 5 | Shelby (city), OH | 9,282 |
| 6 | Upper Sandusky (city), OH | 6,698 |
| 7 | Ontario (city), OH | 6,656 |
| 8 | Crestline (village), OH | 4,525 |
| 9 | Roseland (CDP), OH | 1,495 |
| 10 | Attica (village), OH | 873 |
| 11 | New Washington (village), OH | 873 |
| 12 | Nevada (village), OH | 706 |
| 13 | Caledonia (village), OH | 560 |
| 14 | Iberia (CDP), OH | 431 |
| 15 | Morral (village), OH | 373 |
| 16 | North Robinson (village), OH | 219 |
| 17 | Tiro (village), OH | 219 |
| 18 | Chatfield (village), OH | 205 |
| 19 | Sulphur Springs (CDP), OH | 197 |
| 20 | Harpster (village), OH | 160 |