Community Profile

Population density

• 4,189 per square mile

Population

• 25,975

Male

• 48.2 percent

Female

• 51.8 percent

Median age

• 46 years

Bachelor’s degree or higher

• 78.2% percent

Households

• 9,867

Average household size

• 2.5 persons

Owner-occupied housing units

• 70 percent

Renter-occupied housing units

• 30 percent

Married-couple families

• 62 percent

Families with children under 18 years

• 35 percent

Householder living alone

• 24 percent

Median household

• $136,664

Per capita

• $82,637

Median housing value

• $1,034,600

Median gross rent

• $1,908/month

Typical rate

• $7.51/$1,000 assessed value

Mean travel time to work

• 23.7 minutes

Average winter temperature

• 40° F

Average summer temperature

• 70° F

Average yearly rainfall

(half falls between October and January)

• 39 inches

• The land area of Mercer Island is 6.2 square miles.
• Mercer Island is positioned 47.56° north of the Equator and 122.23° west of the Prime Meridian.
• Mercer Island is the only city in King County situated on an island.
• 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 43rd largest city in the State of Washington.
• Mercer Island has more than 50 miles of marked walking paths and trails.
• 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.
• Over 6,000 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.