Identifiers: city · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Burlington (city), IA | 23,982 |
| 2 | Fort Madison (city), IA | 10,270 |
| 3 | Mount Pleasant (city), IA | 9,274 |
| 4 | West Burlington (city), IA | 3,197 |
| 5 | New London (city), IA | 1,910 |
| 6 | Mediapolis (city), IA | 1,688 |
| 7 | Danville (city), IA | 927 |
| 8 | Beaverdale (CDP), IA | 880 |
| 9 | Morning Sun (city), IA | 752 |
| 10 | Denmark (CDP), IA | 425 |
| 11 | Middletown (city), IA | 363 |
| 12 | Oak Hills (CDP), IA | 186 |
| 13 | Sperry (CDP), IA | 124 |
| 14 | Wever (CDP), IA | 101 |
| 15 | Augusta (CDP), IA | 51 |