Identifiers: city
| Rank | Community | Population |
|---|---|---|
| 1 | Maquoketa (city), IA | 6,128 |
| 2 | DeWitt (city), IA | 5,514 |
| 3 | Bellevue (city), IA | 2,363 |
| 4 | Preston (city), IA | 949 |
| 5 | Long Grove (city), IA | 838 |
| 6 | Grand Mound (city), IA | 615 |
| 7 | Delmar (city), IA | 542 |
| 8 | Wyoming (city), IA | 523 |
| 9 | Lost Nation (city), IA | 434 |
| 10 | Oxford Junction (city), IA | 424 |
| 11 | Miles (city), IA | 408 |
| 12 | Charlotte (city), IA | 389 |
| 13 | Andrew (city), IA | 380 |
| 14 | Calamus (city), IA | 356 |
| 15 | Goose Lake (city), IA | 239 |
| 16 | La Motte (city), IA | 237 |
| 17 | Onslow (city), IA | 201 |
| 18 | Springbrook (city), IA | 143 |
| 19 | Monmouth (city), IA | 129 |
| 20 | Welton (city), IA | 121 |