| Locality | Post Code |
|---|---|
| Benton City, Audrain | 65232 |
| Centralia, Audrain | 65240 |
| Clark, Audrain | 65243 |
| Farber, Audrain | 63345 |
| Laddonia, Audrain | 63352 |
| Martinsburg, Audrain | 65264 |
| Mexico, Audrain | 65265 |
| Riversville, Audrain | 65265 |
| Rush Hill, Audrain | 65280 |
| Thompson, Audrain | 65285 |
| Vandalia, Audrain | 63382 |
| Vandiver, Audrain | 65265 |
| Vandiver Village, Audrain | 65265 |
| Wellsville, Audrain | 63384 |