| Zip Code | City | Population ↓ |
|---|---|---|
| 50659 | New Hampton | 5,986 |
| 50658 | Nashua | 2,427 |
| 50630 | Fredericksburg | 1,568 |
| 50645 | Ionia | 1,391 |
| 52154 | Lawler | 664 |
| 50603 | Alta Vista | 342 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 6 ZCTAs in Chickasaw County, Iowa (US Census).