Identifiers: city · CDP · village
| Rank | Community | Population |
|---|---|---|
| 1 | Tiffin (city), OH | 17,953 |
| 2 | Fremont (city), OH | 15,930 |
| 3 | Bellevue (city), OH | 8,249 |
| 4 | Clyde (city), OH | 6,294 |
| 5 | Ballville (CDP), OH | 3,823 |
| 6 | Gibsonburg (village), OH | 2,452 |
| 7 | Woodville (village), OH | 2,006 |
| 8 | Monroeville (village), OH | 1,300 |
| 9 | Green Springs (village), OH | 1,233 |
| 10 | Stony Prairie (CDP), OH | 1,218 |
| 11 | Bloomville (village), OH | 867 |
| 12 | Bettsville (village), OH | 595 |
| 13 | Republic (village), OH | 556 |
| 14 | Lindsey (village), OH | 457 |
| 15 | Bascom (CDP), OH | 397 |
| 16 | Whites Landing (CDP), OH | 350 |
| 17 | Fort Seneca (CDP), OH | 230 |
| 18 | Flat Rock (CDP), OH | 227 |
| 19 | Helena (village), OH | 211 |
| 20 | Burgoon (village), OH | 183 |