| Place | Post Code |
|---|---|
| Baile uí Cheallaigh (Ballykelly, Lackagh) | W34 |
| Baile na Silíní (Cherryville, Lackagh) | R51 |
| Clondown, Lackagh | W34 |
| Concealment, Lackagh | R51 |
| Coolier, Lackagh | W34 |
| Crossmorris, Lackagh | R51 |
| Hybla, Lackagh | W34 |
| Baile uí Chnáimhín (Knavinstown, Lackagh) | R51 |
| Leacach Beag (Lackagh Beg, Lackagh) | R51, W34 |
| Leacach Mór (Lackaghmore, Lackagh) | R51, W34 |
| Mayfield, Lackagh | W34 |
| Cnocán an Rísigh (Mountrice, Lackagh) | W34 |
| Mullaghroe Lower, Lackagh | W34 |
| Mynagh, Lackagh | R51 |
| Shindala, Lackagh | R51 |
| Tobercocka, Lackagh | W34 |
| Toghereen, Lackagh | W34 |
| Ummeras More, Lackagh | W34 |