| Locality | Post Code |
|---|---|
| Airey, Harrison | 39574 |
| Biloxi, Harrison | 39530, 39531, 39532 |
| Cuevas, Harrison | 39571 |
| Diberville, Harrison | 39540 |
| Gulfport, Harrison | 39501, 39503, 39507 |
| Howison, Harrison | 39574 |
| Long Beach, Harrison | 39560 |
| Orange Grove, Harrison | 39503 |
| Pass Christian, Harrison | 39571 |
| Saint Martin, Harrison | 39532 |
| Saucier, Harrison | 39574 |
| Success, Harrison | 39574 |
| West Biloxi, Harrison | 39531 |
| Wortham, Harrison | 39574 |