| Locality | Post Code |
|---|---|
| Alvo, Cass | 68304 |
| Ashland, Cass | 68003 |
| Avoca, Cass | 68307 |
| Cedar Creek, Cass | 68016 |
| Eagle, Cass | 68347 |
| Elmwood, Cass | 68349 |
| Greenwood, Cass | 68366 |
| Louisville, Cass | 68037 |
| Manley, Cass | 68403 |
| Murdock, Cass | 68407 |
| Murray, Cass | 68409 |
| Nehawka, Cass | 68413 |
| Plattsmouth, Cass | 68048 |
| South Bend, Cass | 68058 |
| Union, Cass | 68455 |
| Wabash, Cass | 68407 |
| Weeping Water, Cass | 68463 |