Mercer Island Flag

Mercer Island

County:
King County
County Seat:
No
Area (mi²):
6.383
State:
Washington

Mercer Island is a city located in King County, Washington. Mercer Island has a 2026 population of 25,302. Mercer Island is currently growing at a rate of 0.95% annually but its population has decreased by -1.74% since the most recent census, which recorded a population of 25,750 in 2020.

25.3K
Total Population
3,964
Density (mi²)
238 0.95%
Growth

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)