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Mercer Island, WA Demographics & ZIP Codes
Mercer Island, Washington demographics and median household income by ZIP code (in King County) — 1 ZIP codes — population 25,282 — median income $202,359 — avg. home value $1,884,200. Compare income, housing, and population across ZIP codes on US5.
Population
25,282
Median household income (avg.)
$202,359
269% of U.S. median
Average home value
$1,884,200
541% of U.S. median
Average rent
$2,332
201% of U.S. median
Median age (avg.)
45.8
Mercer Island demographics
Mercer Island, Washington covers 1 ZIP code primarily in King County, with a combined ZIP-area population of about 25,282.
Across ZIP codes with age data, the average median age is about 45.8 years.
Median household income in Mercer Island
The average median household income across ZIP codes in Mercer Island, Washington is about $202,359 — about 132% above the WA ZIP average ($87,083), and about 169% above the U.S. median ($75,149).
The highest median household income among listed ZIPs is about $202,359 in 98040.
Housing in Mercer Island
For housing in Mercer Island, Washington, the average median home value is about $1,884,200 and the average median rent is about $2,332.
The most populous ZIP in this set is 98040 (about 25,282 residents). Use the table below to compare population, income, and home values across codes.
ZIP codes in Mercer Island
Sort by population, income, or home value. Click a column header to toggle ascending / descending.
| ZIP | City | County | State | Population ↓ | Income | Home value |
|---|---|---|---|---|---|---|
| 98040 | Mercer Island | King County | WA | 25,282 | $202,359 | $1,884,200 |
Frequently asked questions
What are the demographics of Mercer Island?
Mercer Island, Washington has a combined ZIP-area population of about 25,282 across 1 ZIP codes (primarily King County). Browse the ZIP table below for population, income, and housing by code.
What is the median household income in Mercer Island?
The average median household income across ZIP codes in Mercer Island, Washington is about $202,359, about 132% above the state ZIP average ($87,083), and about 169% above the U.S. median ($75,149). Average median home value is about $1,884,200.
How many ZIP codes are in Mercer Island?
Mercer Island, Washington includes 1 ZIP codes on US5. Each row links to demographics, median income, and housing for that code.
Where can I find ZIP code demographics for Mercer Island?
This page lists ZIP codes in Mercer Island, Washington with population, median household income, and home value. Select a ZIP for a full demographics profile.