Residential delivery area · Washington
ZIP Code 98240: Custer, WA
ZIP code 98240 uses the postal name Custer, Washington and lies entirely in Whatcom County (Census 2020 ZIP-county file). About 3,600 people live there (Census Bureau, ACS 2020-2024). Median household income is $110,116 (Census Bureau, ACS 2020-2024). By Census place, 7% of its land lies in Custer (a census-designated place); 93% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Custer · its only residential ZIP
- County
- Whatcom County
- Census places
- Custer census-designated place
- Metro area
- Bellingham, WA
- House district
- WA-2 119th Congress
- State
- Washington
- Time zone
- Pacific
- Land area
- 22.3 sq mi · 161 people per sq mi
Where is ZIP code 98240?
98240 centers on 48.948°, -122.621° and covers 22.3 square miles of land plus 0.0 of water. It borders 3 ZIP codes: 98230, 98248, 98264.
The map draws ZIP code areas only. For the streets inside 98240, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 98240 compare with the rest of Whatcom County?
| Measure | 98240 | In Whatcom County | In WA |
|---|---|---|---|
| People (ACS 2020-2024) | 3,593 | 11th of 18 | 323rd of 605 |
| Median household income | $110k | 1st of 14 | 97th of 363 |
| Median home value | $620k | 3rd of 15 | 114th of 392 |
Its median household income is higher than in 87% of U.S. residential ZIP codes, and it is denser than 60% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 98240?
The 2020 Census counted 3,118 people in 98240; the ACS, which samples households over 2020-2024, estimates 3,593. Between the 2010 and 2020 censuses its population grew 1.9% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 3,593±889 (90% margin)
- 2020 Census count
- 3,118+1.9% since 2010 (3,061)
- Households
- 1,265
- Median age
- 36.9
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 98240?
Of the 3,593 people the ACS estimates in 98240, 28.9% are under 18 and 15.1% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (76.5%), then Hispanic or Latino (19.6%).
- Under 1828.9%
- 18 to 6456.0%
- 65 and older15.1%
- White, not Hispanic76.5%
- Hispanic or Latino19.6%
- Other or two or more2.8%
- Asian, not Hispanic1.0%
- Black, not Hispanic0.1%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 98240 earn?
Median household income is $110,116 (ACS 2020-2024), the highest of the 14 ranked ZIP codes in Whatcom County. It rose from $89,137 in 2015-2019 (in 2024 dollars), a change larger than the surveys' margins of error.
- Median household income
- $110,116±$11,838
- Income per person
- $47,642
- Below the poverty line
- 4.3%
- Unemployed (of the labor force)
- 8.0%
- Adults 25+ with a bachelor's degree
- 23.6%
- Adjusted gross income per tax return, 2022
- $81,7021,600 returns; wages 67% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 98240?
FHFA's house price index for 98240, built from repeat sales and appraisals of the same homes, rose 81% from 2015 to 2025 and rose 30% from 2020 to 2025, and moved −18.0% in 2025.
- Median home value (owners' estimate)
- $619,700
- Median gross rent
- –
- Homes owned by their occupants
- 93.0%
- Housing units
- 1,345
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 98240?
71 business establishments had a location in this ZIP code in 2023, 3 more than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction19
- Retail trade9
- Professional, scientific, and technical services7
- Other services (except public administration)7
- Wholesale trade5
- Administrative and support and waste management and remediation services5
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 98240?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 98230 | Blaine | 18,744 | $87k | 3.8 mi |
| 98248 | Ferndale | 28,498 | $91k | 5.7 mi |
| 98264 | Lynden | 23,123 | $104k | 7.5 mi |
| 98226 | Bellingham | 46,782 | $79k | 13.5 mi (near) |
| 98276 | Nooksack | 1,794 | $97k | 13.7 mi (near) |
| 98225 | Bellingham | 50,216 | $64k | 14.1 mi (near) |
| 98247 | Everson | 9,115 | $89k | 14.4 mi (near) |
| 98262 | Lummi Island | 957 | $83k | 17.6 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.