City profile
Mercer Island, WA
King County · Population 25,307
Mercer Island is a town in King County, WA with about 25,307 residents and a typical home value near $2,000,000. It is 5 miles from Seattle, WA, which shapes its climate, healthcare access and amenities.
Climate
Climate type
Mild & temperate
Winter avg
42°F
Summer avg
66°F
Sunny days / yr
152
Home prices & cost of living
Median home price
$2,000,001
Typical monthly housing
$12,264
Cost of living (100 = U.S.)
231
Taxes
- Property tax
- 0.84%
- State income tax (top)
- None
- Social Security
- Not taxed
- Pensions
- Not taxed
- Sales tax (state + avg. local)
- 9.43%
FEMA natural hazard risk
Very High · county score 100/100
Top hazards: Earthquake, Riverine flooding, Avalanche
Nearest major airport
9 mi to Seattle–Tacoma International Airport (SEA)
Political lean (2024 county vote)
Leans Democratic · 74% Democratic / 23% Republican
Community
Population
25,307
Black population
0.9%
County
King County
Detailed crime figures are available for our 201 hand-researched cities.
2025–2026 trends
2026 market trends
- ▸Climate/cost risks to check: wildfire smoke, earthquakes
Highlights
- About 25,307 residents
- Typical home value about $2,000,000
- 5 miles from Seattle, WA
Trade-offs
- Scores for this place are estimated from Census data and the nearest major city
Figures are estimates from public sources (see How we match). Verify before making decisions.