| Locality | Postal Code |
|---|---|
| Argonia, Sumner | 67004 |
| Ashton, Sumner | 67051 |
| Belle Plaine, Sumner | 67013 |
| Caldwell, Sumner | 67022 |
| Conway Springs, Sumner | 67031 |
| Corbin, Sumner | 67022 |
| Geuda Springs, Sumner | 67051 |
| Hunnewell, Sumner | 67140 |
| Mayfield, Sumner | 67103 |
| Milan, Sumner | 67105 |
| Milton, Sumner | 67106 |
| Mulvane, Sumner | 67110 |
| Oxford, Sumner | 67119 |
| Peck, Sumner | 67120 |
| Riverdale, Sumner | 67152 |
| Sieboldt, Sumner | 67119 |
| South Haven, Sumner | 67140 |
| Udall, Sumner | 67146 |
| Wellington, Sumner | 67152 |