| Locality | Post Code |
|---|---|
| Accident, Garrett | 21520 |
| Bittinger, Garrett | 21522 |
| Bloomington, Garrett | 21523 |
| Crellin, Garrett | 21550 |
| Deer Park, Garrett | 21550 |
| Friendsville, Garrett | 21531 |
| Grantsville, Garrett | 21536 |
| Hutton, Garrett | 21550 |
| Jennings, Garrett | 21536 |
| Kitzmiller, Garrett | 21538 |
| Loch Lynn Heights, Garrett | 21550 |
| McHenry, Garrett | 21541 |
| Mountain Lake Park, Garrett | 21550 |
| Oakland, Garrett | 21550 |
| Sang Run, Garrett | 21541 |
| Shallmar, Garrett | 21538 |
| Swanton, Garrett | 21561 |