| Locality | Post Code |
|---|---|
| Arnold Line, Forrest | 39401 |
| Barrontown, Forrest | 39401 |
| Batson, Forrest | 39401 |
| Bon Homme, Forrest | 39401 |
| Brooklyn, Forrest | 39425 |
| Camp Shelby, Forrest | 39401 |
| Carterville, Forrest | 39401 |
| Dixie, Forrest | 39401 |
| Dixie Pine, Forrest | 39401 |
| Eatonville, Forrest | 39401 |
| Glendale, Forrest | 39401 |
| Harvey, Forrest | 39465 |
| Hattiesburg, Forrest | 39401, 39402, 39406 |
| Hattiesburg South, Forrest | 39401 |
| Indian Springs, Forrest | 39401 |
| Lamar Park, Forrest | 39401 |
| Leeville, Forrest | 39401 |
| Lumberton, Forrest | 39455 |
| Lux, Forrest | 39401 |
| Macedonia, Forrest | 39401 |
| Maxie, Forrest | 39425 |
| Maybank, Forrest | 39401 |
| McCallum, Forrest | 39401 |
| McLaurin, Forrest | 39401 |
| Meyers, Forrest | 39401 |
| Morriston, Forrest | 39401 |