9 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 52577 | Oskaloosa | 14,585 |
| 50207 | New Sharon | 2,325 |
| 52561 | Fremont | 1,112 |
| 52586 | Rose Hill | 600 |
| 52595 | University Park | 545 |
| 52543 | Cedar | 541 |
| 50143 | Leighton | 538 |
| 52534 | Beacon | 321 |
| 50027 | Barnes City | 148 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 9 ZCTAs in Mahaska County, Iowa (US Census).