6 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 50659 | New Hampton | 5,688 |
| 50658 | Nashua | 2,450 |
| 50630 | Fredericksburg | 1,372 |
| 50645 | Ionia | 1,193 |
| 52154 | Lawler | 592 |
| 50603 | Alta Vista | 555 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 6 ZCTAs in Chickasaw County, Iowa (US Census).