| Locality | Post Code |
|---|---|
| Bairdtown, Sullivan | 63556 |
| Boynton, Sullivan | 63556 |
| Browning, Sullivan | 64630 |
| Cora, Sullivan | 63556 |
| Green Castle, Sullivan | 63544 |
| Green City, Sullivan | 63545 |
| Harris, Sullivan | 64645 |
| Humphreys, Sullivan | 64646 |
| Milan, Sullivan | 63556 |
| Mystic, Sullivan | 63545 |
| Newtown, Sullivan | 64667 |
| North Salem, Sullivan | 63566 |
| Owasco, Sullivan | 63556 |
| Pennville, Sullivan | 63545 |
| Pollock, Sullivan | 63560 |
| Reger, Sullivan | 63556 |
| Sidney, Sullivan | 63544 |
| Sorrell, Sullivan | 63556 |
| Winigan, Sullivan | 63566 |