| Localité | Code postal |
|---|---|
| Alger, Skagit | 98233 |
| Allen, Skagit | 98232 |
| Anacortes, Skagit | 98221 |
| Bow, Skagit | 98232 |
| Burlington, Skagit | 98233 |
| Clearlake, Skagit | 98235 |
| Concrete, Skagit | 98237 |
| Conway, Skagit | 98238 |
| Decatur Island, Skagit | 98221 |
| Diablo, Skagit | 98283 |
| Edison, Skagit | 98232 |
| Guemes, Skagit | 98221 |
| Guemes Island, Skagit | 98221 |
| Hamilton, Skagit | 98255 |
| La Conner, Skagit | 98257 |
| Lyman, Skagit | 98263 |
| Marblemount, Skagit | 98267 |
| Mount Vernon, Skagit | 98273, 98274 |
| Newhalem, Skagit | 98283 |
| Rockport, Skagit | 98283 |
| Samish Island, Skagit | 98232 |
| Sedro Woolley, Skagit | 98284 |
| Similk Beach, Skagit | 98221 |
| Upper Skagit Indian Reservation, Skagit | 98233 |