| Locality | Post Code |
|---|---|
| Ash, Monroe | 48117 |
| Augusta, Monroe | 48160 |
| Azalia, Monroe | 48110 |
| Britton, Monroe | 49229 |
| Carleton, Monroe | 48117 |
| Cone, Monroe | 48160 |
| Deerfield, Monroe | 49238 |
| Duncan, Monroe | 48131 |
| Dundee, Monroe | 48131 |
| Erie, Monroe | 48133 |
| Frenchtown, Monroe | 48161 |
| Ida, Monroe | 48140 |
| La Salle, Monroe | 48145 |
| Lambertville, Monroe | 48144 |
| London, Monroe | 48160 |
| Luna Pier, Monroe | 48157 |
| Maybee, Monroe | 48159 |
| Monroe, Monroe | 48161, 48162 |
| Mooreville, Monroe | 48160 |
| Newport, Monroe | 48166 |
| Oakville, Monroe | 48160 |
| Ottawa Lake, Monroe | 49267 |
| Petersburg, Monroe | 49270 |
| Raisinville, Monroe | 48161 |
| Rea, Monroe | 48131 |
| Riga, Monroe | 49276 |