| Locality | Post Code |
|---|---|
| Alta Vista, Chickasaw | 50603 |
| Bassett, Chickasaw | 50645 |
| Boyd, Chickasaw | 50659 |
| Chickasaw, Chickasaw | 50645 |
| Fredericksburg, Chickasaw | 50630 |
| Ionia, Chickasaw | 50645 |
| Jerico, Chickasaw | 50659 |
| Lawler, Chickasaw | 52154 |
| Little Turkey, Chickasaw | 52154 |
| Nashua, Chickasaw | 50658 |
| New Hampton, Chickasaw | 50659 |
| North Washington, Chickasaw | 50659 |
| Saude, Chickasaw | 52154 |
| Sumner, Chickasaw | 50674 |
| Waucoma, Chickasaw | 52171 |