Zip Code | City | Population |
|---|---|---|
| 51503 | Council Bluffs | 37,081 |
| 51501 | Council Bluffs | 35,400 |
| 51510 | Carter Lake | 3,780 |
| 51560 | Oakland | 2,035 |
| 51559 | Neola | 2,000 |
| 51576 | Underwood | 1,960 |
| 51521 | Avoca | 1,857 |
| 51575 | Treynor | 1,663 |
| 51526 | Crescent | 1,560 |
| 51577 | Walnut | 1,326 |
| 51553 | Minden | 1,100 |
| 51525 | Carson | 1,003 |
| 51542 | Honey Creek | 950 |
| 51548 | McClelland | 509 |
| 51536 | Hancock | 418 |
| 51549 | Macedonia | 394 |