Community Information

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Population

Population density – 1,379 per square mile
Population – 23,154
Male – 48.7 percent
Female – 51.3 percent
Median Age – 45 years

Education

Bachelor’s degree or higher – 76 percent

Households

Households – 9,926
Average household size – 2.58 persons
Median family size – 3.03 percent
Owner-occupied housing units – 76.6 percent
Renter-occupied housing units – 24.2 percent
Married-couple families – 65.6 percent
Families with children under 18 years – 35.5 percent
Householder living alone – 22.1 percent
Households with individuals under 18 years – 36.5 percent
Households with individuals 65 years and over – 19.5 percent

Income

Median household – $151,904
Per capita – $123,799

Housing

Median housing value – $1,561,800

Taxes

Typical rate – $9.13/$1,000 assessed value

Commutes

Mean travel time to work – 21.2 minutes

Climate

Average winter temperature – 40 degrees F
Average summer temperature – 70 degrees F
Average yearly rainfall – 35 inches
(half falls between October and January)

Statistics and Facts
  • The land area of Mercer Island is 6.2 square miles.
  • Mercer Island is positioned 47.56 degrees north of the equator, and 122.23 degrees west of the prime meridian.
  • Mercer Island is the only city in King County situated on an island.
  • Mercer Island is the most populated island in a lake in the United States.
  • Mercer Island is the only community in King County in which the boundary of the city and the school district are identical.
  • Mercer Island is the 50th largest city in the State of Washington.
  • Mercer Island has more than 50 miles of marked walking paths and trails.
  • Nearly three quarters of Island residents are college-educated.
  • Mercer Island’s zip code, 98040, is one of the wealthiest in the state.
  • There are about 16,000 registered voters on the Island.
  • About 7,000 people are employed in jobs on the Island.
  • Among the largest employers on the Island are Mercer Island School District and the City of Mercer Island.
Important Contacts

Mercer Island Chamber of Commerce
(206) 232-3404
www.mercerislandchamberofcommerce.org

City of Mercer Island
(206) 275-7600
www.mercergov.org

Mercer Island School District #400
(206) 236-3330
www.mercerislandschools.org

Mercer Island Fire Department
(206) 275-7607
www.mercergov.org/departments

Mercer Island Police Department
Non-emergency: (425) 587-3400
Business calls (206) 275-7610
www.mercergov.org/departments

Mercer Island Community & Events Center
(206) 275-7609
www.meetonmercer.com

Mercer Island Library
(206) 236-3537
www.kcls.org/MI/home.html

Mercer Island Reporter
(206) 232-1215
www.mi-reporter.com
(local/weekly newspaper)

Mercer Island Post Office
(206) 230-5636

Mary Wayte Swimming Pool
(206) 588-1117

King County Elections
(206) 296-1565

Metro Transit
(206) 553-3000
www.kingcounty.gov/metro

Sound Transit
(888) 889-6368
www.soundtransit.org

Utilities
Gas/Electric

Puget Sound Energy
888) 225-5773

Water/Sewer

City of Mercer Island
(206) 236-5300

Telephone

Century Link
(800) 475-7526

Refuse Collection and Recycling

Republic Services
(206) 682-9730

Cable

Comcast
(877) 824-2268