98240 ZIP Code — Custer, WA
Whatcom County, Washington
ZIP code 98240 is located in Custer, Washington, within Whatcom County. It covers approximately 22.26 square miles and serves a population of 3,426 residents. This is a standard ZIP code in the Pacific (PT) timezone, served by area code 360/564.
About ZIP code 98240
The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1990s, giving the area an established character. Median home value is $510,400. Owner-occupancy is high at 88%, well above the national average.
Median household income is $102,602. The poverty rate of 4% is below the national average.
The dominant occupation class is sales and office, with education and healthcare as the leading industry. The average commute of 20 minutes is near the national average.
Educational attainment is near the national average, with 25% of residents holding a bachelor's degree or higher.
3,426
population
22.26
sq mi land
Standard
ZIP type
Pacific (PT)
timezone
98240 ZIP code map
Cities in ZIP code 98240
Below are the cities the US Postal Service accepts for ZIP code 98240. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Custer | Preferred |
Nearby ZIP codes
98230 Blaine (3.3 mi)
98248 Ferndale (5.7 mi)
98264 Lynden (9 mi)
98226 Bellingham (12.8 mi)
98276 Nooksack (13.5 mi)
98247 Everson (13.7 mi)
98225 Bellingham (14.4 mi)
98295 Sumas (17.4 mi)
98262 Lummi Island (17.5 mi)
Demographics
updated 06/2026
| Population | |
|---|---|
| Total population | 3,426 |
| Population density | 154 / sq mi |
| State FIPS | 53 |
| County FIPS | 073 |
| Geography | |
|---|---|
| Land area | 22.26 sq mi |
| Water area | 0.02 sq mi |
| Latitude | 48.9461 |
| Longitude | -122.6171 |
| Timezone | Pacific (PT) |
| Area code | 360/564 |
Total population by age
Gender
Race & ethnicity
Economics
updated 06/2026
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 22.6% | 37.7% | 31.7% |
| $50k – $100k | 51.4% | 33.5% | 30.6% |
| $100k – $200k | 20.2% | 23.7% | 27.1% |
| Over $200k | 5.8% | 5.1% | 10.6% |
Demographics & statistics
3,426
Population
154
People per sq mi
40.7
Median age
$102,602
Median household income
$46,973
Per capita income
$510,400
Median home value
$1,433
Median monthly rent
88.4%
Home ownership
3.5%
Poverty rate
7.3%
Unemployment
1,131
Housing units
25.1%
Bachelor's or higher
Age distribution
Male
Female
35
Under 5
35
203
5–9
203
170
10–14
169
123
15–19
122
28
20–24
28
140
25–34
139
300
35–44
300
265
45–54
265
138
55–59
138
109
60–64
108
167
65–74
166
38
75–84
37
← Male
Female →
Age summary
| Group | Count | % |
|---|---|---|
| Under 18 | 983 | 28.7% |
| 18 and over | 2,443 | 71.3% |
| 65 and over | 408 | 11.9% |
| Median age | 40.7 years | |
Race & ethnicity
White
77.3%
Hispanic or Latino
10.4%
Other race
8.8%
Two or more races
3.5%
| Group | Count | % |
|---|---|---|
| White | 2,957 | 77.3% |
| Hispanic or Latino | 399 | 10.4% |
| Other race | 336 | 8.8% |
| Two or more races | 133 | 3.5% |
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 22.6% | 37.7% | 31.7% |
| $50k – $100k | 51.4% | 33.5% | 30.6% |
| $100k – $200k | 20.2% | 23.7% | 27.1% |
| Over $200k | 5.8% | 5.1% | 10.6% |
Under $10k
1.7%
$15k–$25k
6.0%
$25k–$35k
0.8%
$35k–$50k
6.7%
$50k–$75k
12.3%
$75k–$100k
18.5%
$100k–$150k
39.3%
$150k–$200k
3.1%
$200k+
11.6%
| Range | % of households |
|---|---|
| Under $10k | 1.7% |
| $15k–$25k | 6.0% |
| $25k–$35k | 0.8% |
| $35k–$50k | 6.7% |
| $50k–$75k | 12.3% |
| $75k–$100k | 18.5% |
| $100k–$150k | 39.3% |
| $150k–$200k | 3.1% |
| $200k+ | 11.6% |
| Median income | $102,602 |
Housing
Home values
Under $50k
1.0%
$100k–$150k
1.6%
$200k–$300k
16.9%
$300k–$500k
29.1%
$500k–$1M
49.0%
$1M+
2.4%
Housing overview
| Metric | Value |
|---|---|
| Median home value | $510,400 |
| Median rent / month | $1,433 |
| Owner occupied | 88.4% |
| Renter occupied | 11.6% |
| Vacant | 3.8% |
| Single-family detached | 80.4% |
| Large apartment buildings | 0.0% |
| Mobile homes | 19.6% |
| Median rooms | 6.8 |
| Avg household size (owned) | 2.70 |
Year built
| Era | % |
|---|---|
| 2020 or later | 0.0% |
| 2010–2019 | 10.2% |
| 2000–2009 | 11.1% |
| 1990–1999 | 28.6% |
| 1980–1989 | 22.5% |
| 1970–1979 | 16.4% |
| 1960–1969 | 1.6% |
| 1950–1959 | 1.3% |
| 1940–1949 | 0.5% |
| 1939 or earlier | 7.8% |
Bedrooms
| Size | % of units |
|---|---|
| No bedroom (studio) | 0.0% |
| 1 bedroom | 0.5% |
| 2 bedrooms | 7.1% |
| 3 bedrooms | 51.6% |
| 4 bedrooms | 39.4% |
| 5+ bedrooms | 1.3% |
Vehicles per household
| Vehicles | % of households |
|---|---|
| No vehicle | 0.9% |
| 1 vehicle | 6.3% |
| 2 vehicles | 27.8% |
| 3 or more | 65.0% |
Heating fuel
| Fuel type | % |
|---|---|
| Utility gas | 6.9% |
| Electricity | 48.1% |
| Propane / LP gas | 24.9% |
| Fuel oil | 10.4% |
| Wood | 6.4% |
Households & families
| Household type | Count | % |
|---|---|---|
| Married-couple family | 735 | 60.0% |
| Cohabiting couple | 252 | 20.6% |
| Male householder, no spouse | 53 | 4.3% |
| Female householder, no spouse | 185 | 15.1% |
| Households with children under 18 | 534 | 43.6% |
| Households with seniors (65+) | 285 | 23.3% |
| Average household size | 2.79 | |
Marital status
| Status | Male | Female |
|---|---|---|
| Never married | 37.6% | 20.0% |
| Married | 56.2% | 60.0% |
| Separated | 0.7% | 1.9% |
| Widowed | 1.1% | 7.5% |
| Divorced | 4.3% | 10.6% |
Education
Less than 9th grade
4.3%
Some HS, no diploma
4.3%
HS graduate
31.7%
Some college, no degree
18.3%
Associate's degree
16.3%
Bachelor's degree
19.3%
Graduate / professional
5.8%
| Metric | % |
|---|---|
| HS diploma or higher | 91.4% |
| Bachelor's or higher | 25.1% |
School enrollment (ages 3–17)
| Type | Count | % |
|---|---|---|
| Nursery / preschool | 92 | 8.8% |
| Kindergarten | 47 | 4.5% |
| Elementary school | 608 | 58.3% |
| High school | 224 | 21.5% |
| College / grad school | 71 | 6.8% |
Employment
Industry of employment
Education & healthcare
16.3%
Manufacturing
15.4%
Transportation & utilities
12.1%
Professional & management
10.6%
Retail trade
8.0%
Construction
7.9%
Agriculture & mining
6.6%
Finance & real estate
6.1%
Information
4.6%
Public administration
3.8%
Wholesale trade
3.3%
Arts, food & hospitality
2.7%
Other services
2.6%
Occupation
| Category | % |
|---|---|
| Management, business & arts | 26.7% |
| Service | 11.0% |
| Sales & office | 31.1% |
| Natural resources & construction | 16.5% |
| Production & transportation | 14.8% |
Employment type
| Type | % |
|---|---|
| Private sector | 76.4% |
| Government | 16.5% |
| Self-employed | 7.1% |
| Unpaid family workers | 0.0% |
Commute
| Method | % |
|---|---|
| Drive alone | 76.5% |
| Carpool | 10.9% |
| Public transit | 0.1% |
| Walk | 1.5% |
| Work from home | 10.0% |
| Other means | 1.1% |
| Avg commute (minutes) | 20.1 |
Poverty
All people
3.5%
Under 18 years
3.8%
18 and over
3.4%
Married-couple families
1.0%
Female-led households
14.0%
Income support
| Source | % of households |
|---|---|
| Social Security | 26.0% |
| Retirement income | 16.7% |
| Supplemental Security | 2.0% |
| Cash public assistance | 0.6% |
| Food stamps / SNAP | 13.1% |
Health indicators
| Condition | % |
|---|---|
| Obesity | 29.3% |
| High blood pressure | 31.2% |
| High cholesterol | 32.9% |
| Diabetes | 9.2% |
| Heart disease | 6.1% |
| Stroke | 2.9% |
| Asthma | 10.7% |
| Arthritis | 26.2% |
| Kidney disease | 2.8% |
| Pulmonary disease | 6.5% |
| Cancer | 6.7% |
| Behavior / access | % |
|---|---|
| Smoking | 16.9% |
| Binge drinking | 19.0% |
| No physical activity | 16.8% |
| Less than 7 hrs sleep | 28.6% |
| Depression | 27.9% |
| Fair or poor health | 13.4% |
| Poor mental health | 15.0% |
| Poor physical health | 10.8% |
| No health insurance | 10.6% |
| Visited doctor (checkup) | 69.0% |
| Visited dentist | 67.7% |
| Cholesterol screening | 88.7% |
| Teeth loss | 10.8% |
Veterans & disability
| Veterans | Count | % |
|---|---|---|
| Civilian veterans | 137 | 5.6% |
| Disability | % |
|---|---|
| Any disability | 12.2% |
| Under 18 | 6.7% |
| 18–64 years | 13.4% |
| 65 and over | 19.6% |
Health insurance coverage
| Type | % |
|---|---|
| Private insurance | 64.4% |
| Public insurance | 35.6% |
| No insurance | 11.7% |
| Uninsured under 19 | 7.1% |
Language & origin
Language spoken at home (age 5+)
| Language | Count | % |
|---|---|---|
| English only | 3,356 | 98.0% |
| Spanish | 132 | 3.9% |
| Other Indo-European | 132 | 3.9% |
| Asian & Pacific Islander | 0 | 0.0% |
| Other languages | 0 | 0.0% |
Place of birth & citizenship
| Origin | Count | % |
|---|---|---|
| Native born (US) | 3,032 | 88.5% |
| Born in same state | 2,874 | 83.9% |
| Born in different state | 2,082 | 60.8% |
| Foreign born | 158 | 4.6% |
| Naturalized citizen | 394 | 11.5% |
| Not a US citizen | 83 | 21.1% |
Ancestry
| Ancestry | Count | % |
|---|---|---|
| French | 433 | 12.6% |
| Polish | 305 | 8.9% |
| Italian | 267 | 7.8% |
| English | 189 | 5.5% |
| Ancestry | Count | % |
|---|---|---|
| Arab | 76 | 2.2% |
| Dutch | 37 | 1.1% |
| German | 32 | 0.9% |
| Norwegian | 13 | 0.4% |
Technology access
| Metric | % of households |
|---|---|
| Computer access | 35.8% |
| Internet access | 98.2% |
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 98240
What city is ZIP code 98240 in?
ZIP code 98240 is primarily assigned to Custer, Washington.
What county is ZIP code 98240 in?
ZIP code 98240 falls within Whatcom County, Washington.
Is ZIP code 98240 mostly owner-occupied?
88% of occupied units in ZIP code 98240 are owner-occupied, well above the national average.
What is the typical home value in ZIP code 98240?
The median home value in ZIP code 98240 is $510,400.
What is the median household income in ZIP code 98240?
The median household income in ZIP code 98240 is $102,602, above the national median of ~$75,000.
What is the population of ZIP code 98240?
ZIP code 98240 has an estimated population of 3,426 residents, with a density of 154 people per square mile.
What timezone is ZIP code 98240 in?
ZIP code 98240 observes the PST timezone.