Zip Code | City | Population |
|---|---|---|
| 52627 | Fort Madison | 12,719 |
| 52632 | Keokuk | 12,087 |
| 52656 | West Point | 2,295 |
| 52625 | Donnellson | 2,204 |
| 52639 | Montrose | 1,560 |
| 52626 | Farmington | 1,198 |
| 52658 | Wever | 929 |
| 52624 | Denmark | 581 |
| 52619 | Argyle | 573 |
| 52630 | Hillsboro | 230 |
| 52657 | Saint Paul | 65 |
| 52631 | Houghton | 61 |