| Locality | Post Code |
|---|---|
| Atlanta, Cass | 75551 |
| Avinger, Cass | 75630 |
| Bivins, Cass | 75555 |
| Bloomburg, Cass | 75556 |
| Carterville, Cass | 75563 |
| Domino, Cass | 75572 |
| Douglassville, Cass | 75560 |
| Galloway, Cass | 75551 |
| Hughes Springs, Cass | 75656 |
| Kildare, Cass | 75562 |
| Lanark, Cass | 75572 |
| Lanier, Cass | 75563 |
| Linden, Cass | 75563 |
| Marietta, Cass | 75566 |
| McLeod, Cass | 75565 |
| New Colony, Cass | 75563 |
| Ofarrell, Cass | 75551 |
| Queen City, Cass | 75572 |
| Smyrna, Cass | 75551 |
| Springdale, Cass | 75572 |
| Union Chapel, Cass | 75560 |
| Warlock, Cass | 75630 |
| Wiggins, Cass | 75555 |