| Locality | Post Code |
|---|---|
| Adair, McDonough | 61411 |
| Bardolph, McDonough | 61416 |
| Blandinsville, McDonough | 61420 |
| Bushnell, McDonough | 61422 |
| Colchester, McDonough | 62326 |
| Fandon, McDonough | 62326 |
| Good Hope, McDonough | 61438 |
| Industry, McDonough | 61440 |
| Macomb, McDonough | 61455 |
| Prairie City, McDonough | 61470 |
| Sciota, McDonough | 61475 |
| Tennessee, McDonough | 62374 |
| Walnut Grove, McDonough | 61470 |