10 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 50579 | Rockwell City | 3,153 |
| 50563 | Manson | 2,468 |
| 51449 | Lake City | 2,020 |
| 50575 | Pomeroy | 649 |
| 50561 | Lytton | 592 |
| 50538 | Farnhamville | 562 |
| 51453 | Lohrville | 537 |
| 50586 | Somers | 235 |
| 50552 | Knierim | 75 |
| 50551 | Jolley | 45 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 10 ZCTAs in Calhoun County, Iowa (US Census).