County ZIP codes · Washington · FIPS 53073
Whatcom County, WA ZIP Codes
Whatcom County, Washington has 21 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 18 residential and 3 for PO boxes or a single organization. 16 of the residential ones lie mainly in Whatcom County and 2 mainly in a neighboring county; 4 cross the county line. Median household income ranges from $51,361 in 98266 (Maple Falls) to $110,116 in 98240 (Custer) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Whatcom County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $78,125 and $93,006.
They carry 16 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 18 residential ZIP codes in Whatcom County
16 ZIP codes lie mainly in Whatcom County; 2 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 98225 | Bellingham | 50,216 | 3,978 | $64k | $631k | 100% |
| 98226 | Bellingham | 46,782 | 442 | $79k | $608k | 100% |
| 98229 | Bellingham | 33,298 | 664 | $91k | $634k | 95% |
| 98248 | Ferndale | 28,498 | 397 | $91k | $590k | 100% |
| 98264 | Lynden | 23,123 | 405 | $104k | $609k | 100% |
| 98230 | Blaine | 18,744 | 441 | $87k | $500k | 100% |
| 98247 | Everson | 9,115 | 137 | $89k | $564k | 100% |
| 98266 | Maple Falls | 4,245 | 84 | $51k | $421k | 100% |
| 98240 | Custer | 3,593 | 161 | $110k | $620k | 100% |
| 98295 | Sumas | 3,279 | 105 | $99k | $456k | 100% |
| 98244 | Deming | 2,994 | 6 | $67k | $447k | 100% |
| 98276 | Nooksack | 1,794 | 2,537 | $97k | $524k | 100% |
| 98281 | Point Roberts | 1,288 | 264 | $78k | $484k | 100% |
| 98262 | Lummi Island | 957 | 103 | $83k | $579k | 100% |
| 98220 | Acme | 541 | 27 | $92k | $369k | 100% |
| 98283 | Rockport | 442 | 1 | $72k | $338k | 96% |
Partly in Whatcom County
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
4 ZIP codes of Whatcom County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Whatcom | Elsewhere |
|---|---|---|
| 98229 | 95% | Skagit County 5% |
| 98284 | 7% | Skagit County 93% |
| 98237 | 15% | Skagit County 85% |
| 98283 | 96% | Skagit County 4% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Whatcom County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Whatcom County starts with 982.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 982 | Seattle, WA (SCF 980) | 21 | 76 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.