| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Braddan, Douglas | IM4 |
| Postal/ZIP Codes in Castleward, Douglas | IM4 5EJ |
| Postal/ZIP Codes in Cooil, Douglas | IM4 2AQ, IM4 2AG |
| Postal/ZIP Codes in Cronkbourne, Douglas | IM4 |
| Postal/ZIP Codes in Douglas, Douglas | IM1, IM2, IM4 |
| Postal/ZIP Codes in Kewaigue, Douglas | IM2, IM4 |
| Postal/ZIP Codes in Mount Murray, Douglas | IM4 |
| Postal/ZIP Codes in Mount Rule, Douglas | IM4 |
| Postal/ZIP Codes in Port Soderick, Douglas | IM4 |
| Postal/ZIP Codes in Strang, Douglas | IM4 |
| Postal/ZIP Codes in Tromode, Douglas | IM4 4QD, IM4 4RG, IM4 … |