| Locality | Post Code |
|---|---|
| Balladoole, Castletown | IM9 |
| Castletown, Castletown | IM9 |
| Fort Island, Castletown | IM9 1UA |
| Great Meadow, Castletown | IM9 4EB |
| Pooilvaaish, Castletown | IM9 4PH |
| Ronague, Castletown | IM9 |
| Scarlett, Castletown | IM9 |
| Strandhall, Castletown | IM9 4PL |
| Rushen Postal Codes | |
|---|---|
| Rushen | Port Saint Mary |
| Port Erin | Malew |
| Castletown | Arbory |