| Locality | Post Code |
|---|---|
| Ault Field, Island | 98277 |
| Camano Island, Island | 98282 |
| Clinton, Island | 98236 |
| Coupeville, Island | 98239 |
| Freeland, Island | 98249 |
| Greenbank, Island | 98253 |
| Langley, Island | 98260 |
| Maxwelton, Island | 98236 |
| Oak Harbor, Island | 98277 |
| Possession, Island | 98236 |
| Stanwood, Island | 98282 |