| Place | Post Code |
|---|---|
| Baile uí Mhuirígh (Ballymurray, Carn) | N37 |
| Béal Linne (Baylin, Carn) | N37 |
| Bellville (Belville, Carn) | N37 |
| An Cheapach (Cappagh, Carn) | N37 |
| Carn Park, Carn | N37 |
| Clonrelick, Carn | N37 |
| Coolvuck, Carn | N37 |
| Fossagh, Carn | N37 |
| High Warren, Carn | N37 |
| Killinroan, Carn | N37 |
| Mackanrany, Carn | N37 |
| An Machaire Mór (Magheramore, Carn) | N37 |
| Nahad, Carn | N37 |
| An Tulaigh (Tully, Carn) | N37 |
| Tullywood, Carn | N37 |
| Twyford, Carn | N37 |
| Tyford, Carn | N37 |
| Baile Liam (Williamstown, Carn) | N37 |