10 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 50579 | Rockwell City | 3,034 |
| 50563 | Manson | 2,505 |
| 51449 | Lake City | 1,950 |
| 50575 | Pomeroy | 696 |
| 50538 | Farnhamville | 661 |
| 50561 | Lytton | 585 |
| 51453 | Lohrville | 500 |
| 50586 | Somers | 272 |
| 50551 | Jolley | 96 |
| 50552 | Knierim | 76 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 10 ZCTAs in Calhoun County, Iowa (US Census).