Mercer Island

Population

25,912 (2020)

Type

City

Area

6.38 sq mi (16.53 km²), 6.52 sq mi water

Median age

46

Households

9,109

Persons per household

2.5

Median household income

$142,413

Average house value

$1,135,200

Businesses

832

Employees

7,169

Government

CITY OF MERCER ISLAND

Government office

9611 SE 36TH ST, MERCER ISLAND, WA 98040