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Advertise here →Mercer Island, WA · Market Data
Mercer Island, Washington real estate market data.
Real estate market data for Mercer Island, WA (King County) — Census median home value $1,884,200, county listing prices down about 4.0% over the past year.
Mercer Island, WA is in King County, Washington — covering the whole local market here: resale homes, condos, land, and new construction. The most recent Census estimate puts the population at 25,282, with a median household income of $202,359. Census data puts Mercer Island's median home value at $1,884,200 (all owner-occupied homes); King County's current median listing price runs $850,000, down about 4.0% over the past year.
At a glance
Mercer Island market snapshot
Population
25,282
Median Household Income
$202,359
Median Home Value (city)
$1,884,200
Median Listing Price (King County)
$850,000
Median Gross Rent
$2,464/mo
Price Trend (YoY)
-4.0%
Market data compiled from public sources; deemed reliable but not guaranteed; verify independently. Full source list ↗
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Advertise here →Why Mercer Island
What makes Mercer Island different
Home Value, By Source
The Census Bureau's American Community Survey (2023 5-year estimate) puts Mercer Island's median home value — across all owner-occupied homes, not just recent sales — at $1,884,200. Separately, King County's current median listing price (via Realtor.com data, 2026-06-01) runs $850,000. These cover different geography (city vs. county) and different measures (assessed value vs. active listings), which is why we show both rather than picking one — full source list on our data sources page.
County Price Trend
King County's FHFA house price index shows a 0.89% annual change in 2025.
Population & Income
Mercer Island has an estimated population of 25,282 and a median household income of $202,359, per the Census Bureau's American Community Survey (2023 5-year estimate).
Affordability Snapshot
Mercer Island's Census-reported median home value works out to about 9.3x the area's median household income, and median gross rent runs roughly 15% of that same income on an annualized basis. Housing economists commonly flag a price-to-income ratio above 4x as historically elevated -- useful context, not a personal affordability verdict.
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Common questions
Mercer Island FAQ
What are home values like in Mercer Island, WA?
The Census Bureau's American Community Survey puts Mercer Island's median home value at $1,884,200. King County's current median listing price runs $850,000, down about 4.0% over the past year.
What is the population of Mercer Island, WA?
The U.S. Census Bureau's American Community Survey (2023 5-year estimate) puts Mercer Island's population at approximately 25,282.
What's the median rent in Mercer Island, WA?
The Census ACS estimates median gross rent in Mercer Island at approximately $2,464 per month.
What is the median household income in Mercer Island, WA?
Census ACS data puts the median household income in Mercer Island at approximately $202,359.
Is the Mercer Island housing market growing?
King County's FHFA house price index shows a 0.89% annual change in 2025.
Is Mercer Island, WA affordable relative to income?
Census ACS data puts Mercer Island's median home value at about 9.3 times the median household income, with median gross rent equal to roughly 15% of that income annually. This is a general benchmark, not a personal pre-qualification -- your own income, debt, and down payment determine what you can actually afford.
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