| Zip Code | City | Population ↓ |
|---|---|---|
| 98225 | Bellingham | 49,667 |
| 98226 | Bellingham | 45,703 |
| 98229 | Bellingham | 34,157 |
| 98248 | Ferndale | 27,147 |
| 98264 | Lynden | 22,334 |
| 98230 | Blaine | 18,605 |
| 98247 | Everson | 8,468 |
| 98266 | Maple Falls | 3,983 |
| 98240 | Custer | 3,426 |
| 98244 | Deming | 3,284 |
| 98295 | Sumas | 3,033 |
| 98276 | Nooksack | 1,564 |
| 98281 | Point Roberts | 1,249 |
| 98262 | Lummi Island | 965 |
| 98220 | Acme | 577 |
| 98283 | Rockport | 466 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 16 ZCTAs in Whatcom County, Washington (US Census).