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ZIP Code 98040
Mercer Island, WA, King County
Population
25,307
Land area
6.4sq mi
People per sq mi
3,965
City
Mercer Island
ZIP 98040 and nearby ZIP codes
ZIP 98040 at a glance
- ZIP 98040 (Mercer Island) is about 34 times as dense as Washington as a whole.
- Households here earn a median of $219,069 a year, about 2.2 times the Washington figure of $98,141.
- A typical owner-occupied home is valued at more than $2,000,000 and median rent is $2,502 a month.
Local data for ZIP 98040
Counts from official public data
Housing and community stats
ZIP 98040, American Community Survey 2020-2024
Median household income
$219,069
Poverty rate
3.8%
Median home value
$2,000,000+
Prices +32.8% in a year
Median rent
$2,502/mo
Homeownership
67.0%
Bachelor's or higher
81.4%
Median age
46.4
Average commute
23.6 min
Economy and federal money
Businesses, pandemic loans and political donations
Business establishments
830
ZIP Business Patterns 2023
Employees
7,524
$467M annual payroll
PPP loans
$72.4M
857 loans
Campaign donations
$2M
48% D, 6% R, 2026 cycle
Environment and hazard risk
ZIP 98040, from FEMA, NOAA and EPA
Natural hazard risk
Very High
Top: earthquake
Storm events since 1996
75
Countywide, mostly lightning
Flood insurance policies
4,529
0.8% of homes, county
July high / Jan low
77° / 37°F
36.5 inches of rain a year
Health statistics
Share of adults in ZIP 98040, CDC PLACES estimates
Obesity
19.6%
U.S. 33.3% -13.7 pts
Diabetes
7.4%
U.S. 12.1% -4.7 pts
Smoking
4.9%
U.S. 12.8% -7.9 pts
Uninsured (18-64)
4.0%
U.S. 11.1% -7.1 pts
Frequently asked questions
- What city is ZIP code 98040?
- ZIP code 98040 is in Mercer Island, WA (King County).
- What county is ZIP code 98040 in?
- ZIP code 98040 is mostly in King County, Washington.
- How many people live in ZIP code 98040?
- About 25,307 people live in the 98040 ZIP Code Tabulation Area, based on American Community Survey 5-year estimates.
Source: U.S. Census Bureau (ZIP Code Tabulation Areas, American Community Survey) · Data as of 12/31/2023. ZIP Code Tabulation Areas closely match, but are not identical to, USPS ZIP code delivery areas.