| ZIP Code | ZIP Code Place Name | County | ZIP Code Type |
|---|---|---|---|
| 50027 | Barnes City | Mahaska County | Standard |
| 50044 | Bussey | Marion County | Standard |
| 50104 | Gibson | Keokuk County | Standard |
| 50143 | Leighton | Mahaska County | Standard |
| 50153 | Lynnville | Jasper County | Standard |
| 50207 | New Sharon | Mahaska County | Standard |
| 50219 | Pella | Marion County | Standard |
| 50256 | Tracy | Marion County | Standard |
| 50268 | What Cheer | Keokuk County | Standard |
| 52534 | Beacon | Mahaska County | Standard |
| 52543 | Cedar | Mahaska County | Standard |
| 52553 | Eddyville | Mahaska County | Standard |
| 52561 | Fremont | Mahaska County | Standard |
| 52577 | Oskaloosa | Mahaska County | Standard |
| 52586 | Rose Hill | Mahaska County | Standard |
| 52595 | University Park | Mahaska County | PO Box |