| Locality | Post Code |
|---|---|
| Alhambra, Madison | 62001 |
| Alton, Madison | 62002 |
| Bethalto, Madison | 62010 |
| Cloverleaf, Madison | 62060 |
| Collinsville, Madison | 62234 |
| Cottage Hills, Madison | 62018 |
| Dorsey, Madison | 62021 |
| Dunlap Lake, Madison | 62025 |
| Eagle Park, Madison | 62060 |
| East Alton, Madison | 62024 |
| Edwardsville, Madison | 62025 |
| Fort Russell, Madison | 62010 |
| Glen Carbon, Madison | 62034 |
| Godfrey, Madison | 62035 |
| Granite City, Madison | 62040 |
| Grantfork, Madison | 62249 |
| Hamel, Madison | 62046 |
| Hartford, Madison | 62048 |
| Highland, Madison | 62249 |
| Holiday Shores, Madison | 62025 |
| Kaufman, Madison | 62001 |
| Livingston, Madison | 62058 |
| Lumaghi Heights, Madison | 62234 |
| Madison, Madison | 62060 |
| Marine, Madison | 62061 |
| Maryville, Madison | 62062 |