| Zip Code | City | Population ↓ |
|---|---|---|
| 52577 | Oskaloosa | 14,437 |
| 50207 | New Sharon | 2,313 |
| 52561 | Fremont | 1,054 |
| 52586 | Rose Hill | 619 |
| 50143 | Leighton | 546 |
| 52595 | University Park | 539 |
| 52534 | Beacon | 420 |
| 52543 | Cedar | 420 |
| 50027 | Barnes City | 288 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 9 ZCTAs in Mahaska County, Iowa (US Census).