| Locality | Post Code |
|---|---|
| Burksville, Monroe | 62298 |
| Chaflin Bridge, Monroe | 62244 |
| Columbia, Monroe | 62236 |
| Floraville, Monroe | 62298 |
| Foster Pond, Monroe | 62298 |
| Fountain, Monroe | 62295 |
| Fults, Monroe | 62244 |
| Harrisonville, Monroe | 62295 |
| Hecker, Monroe | 62248 |
| Lou Del, Monroe | 62298 |
| Madonnaville, Monroe | 62298 |
| Maeystown, Monroe | 62256 |
| Merrimac, Monroe | 62295 |
| Monroe City, Monroe | 62298 |
| New Hanover, Monroe | 62298 |
| Paderborn, Monroe | 62298 |
| Renault, Monroe | 62279 |
| Saint Joe, Monroe | 62298 |
| Tipton, Monroe | 62298 |
| Valmeyer, Monroe | 62295 |
| Wartburg, Monroe | 62298 |
| Waterloo, Monroe | 62298 |