| Post Office | Rockwell City |
| Division | Calhoun |
| Zipcode | 50579 |
| Post Office | Manson |
| Division | Calhoun |
| Zipcode | 50563 |
| Post Office | Lake City |
| Division | Calhoun |
| Zipcode | 51449 |
| Post Office | Pomeroy |
| Division | Calhoun |
| Zipcode | 50575 |
| Post Office | Lohrville |
| Division | Calhoun |
| Zipcode | 51453 |
| Post Office | Lytton |
| Division | Calhoun |
| Zipcode | 50561 |
| Post Office | Farnhamville |
| Division | Calhoun |
| Zipcode | 50538 |
| Post Office | Somers |
| Division | Calhoun |
| Zipcode | 50586 |
| Post Office | Jolley |
| Division | Calhoun |
| Zipcode | 50551 |
| Post Office | Knierim |
| Division | Calhoun |
| Zipcode | 50552 |
10 City in Calhoun | List of Zip Codes Location In Iowa and Your selected County Calhoun