13 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 98273 | Mount Vernon | 30,001 |
| 98284 | Sedro Woolley | 27,835 |
| 98221 | Anacortes | 23,562 |
| 98274 | Mount Vernon | 18,860 |
| 98233 | Burlington | 17,850 |
| 98237 | Concrete | 4,956 |
| 98257 | La Conner | 4,277 |
| 98232 | Bow | 4,054 |
| 98235 | Clearlake | 531 |
| 98267 | Marblemount | 314 |
| 98263 | Lyman | 200 |
| 98255 | Hamilton | 198 |
| 98238 | Conway | 46 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 13 ZCTAs in Skagit County, Washington (US Census).