13 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 98273 | Mount Vernon | 30,078 |
| 98284 | Sedro Woolley | 26,970 |
| 98221 | Anacortes | 23,211 |
| 98274 | Mount Vernon | 19,247 |
| 98233 | Burlington | 17,703 |
| 98237 | Concrete | 5,110 |
| 98257 | La Conner | 4,448 |
| 98232 | Bow | 3,938 |
| 98235 | Clearlake | 515 |
| 98267 | Marblemount | 275 |
| 98255 | Hamilton | 201 |
| 98263 | Lyman | 201 |
| 98238 | Conway | 44 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 13 ZCTAs in Skagit County, Washington (US Census).