13 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 98273 | Mount Vernon | 30,430 |
| 98284 | Sedro Woolley | 27,688 |
| 98221 | Anacortes | 22,969 |
| 98274 | Mount Vernon | 18,360 |
| 98233 | Burlington | 16,952 |
| 98237 | Concrete | 4,979 |
| 98257 | La Conner | 4,484 |
| 98232 | Bow | 3,939 |
| 98235 | Clearlake | 570 |
| 98255 | Hamilton | 312 |
| 98263 | Lyman | 178 |
| 98267 | Marblemount | 160 |
| 98238 | Conway | 45 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 13 ZCTAs in Skagit County, Washington (US Census).