Mercer Island, Washington

Mercer Island, Washington
City
Aerial view of Mercer Island from the north
Seal
Interactive map of Mercer Island, Washington
Coordinates: 47°34′24″N 122°14′19″W
Country	United States
State	Washington
County	King
Incorporated	July 5, 1960
Government
• Type	Council–manager
• Mayor	Dave Rosenbaum
• City manager	Jessi Bond
Area
• Total	12.90 sq mi (33.41 km2)
• Land	6.38 sq mi (16.53 km2)
• Water	6.52 sq mi (16.88 km2)
Elevation	75 ft (23 m)
Population  (2020)
• Total	25,748
• Estimate  (2024)	25,302
• Density	3,880/sq mi (1,497/km2)
Time zone	UTC−8 (Pacific (PST))
• Summer (DST)	UTC−7 (PDT)
ZIP Code	98040
Area code	206
FIPS code	53-45005
GNIS feature ID	2411082
Website	mercerisland.gov

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Mercer Island is a city in King County, Washington, United States, located on an island of the same name in the southern portion of Lake Washington. Mercer Island is in the Seattle metropolitan area, connected to the mainland on both sides by bridges carrying Interstate 90 and Link light rail, with the city of Seattle to the west and the city of Bellevue to the east.

The population was 25,748 at the 2020 census. Mercer Island is one of the 100 richest ZIP codes in the US, according to the IRS figures for adjusted gross income.