Education

The Mercer Island School District comprises seven common schools on the island: four primary schools (Lakeridge Elementary, Island Park Elementary, West Mercer Elementary and Northwood Elementary); one Middle school (Islander Middle School); one High school (Mercer Island High School); one alternative secondary school (Crest Learning Center).^[13]
Mercer Island is also home to the St. Monica School(K-8), the French American School of Puget Sound (P-8), and the Northwest Yeshiva High School (9-12).

Demographics

Historical population
Census	Pop.		%±
1970	19,047		—
1980	21,522		13.0%
1990	20,816		−3.3%
2000	22,036		5.9%
2010	22,699		3.0%
Est. 2015	25,042	[14]	10.3%
U.S. Decennial Census[15] 2015 Estimate[4]

According to a 2012 estimate, the median income for a household in the city was $127,360, and the median income for a family was $154,050. The per capita income for the city was $74,056.^{[citation needed]}
Washington State's Office of Financial Management also publishes per-county, per-city population statistics of its own. Its 2013 estimate was 22,720.^[16]

2010 census

As of the census^[3] of 2010, there were 22,699 people, 9,109 households, and 6,532 families residing in the city. The population density was 3,591.6 inhabitants per square mile (1,386.7/km²). There were 9,930 housing units at an average density of 1,571.2 per square mile (606.6/km²). The racial makeup of the city was 77.9% White, 1.3% African American, 0.2% Native American, 15.9% Asian, 0.1% Pacific Islander, 0.7% from other races, and 3.9% from two or more races. Hispanic or Latino of any race were 2.8% of the population.
There were 9,109 households of which 33.5% had children under the age of 18 living with them, 62.3% were married couples living together, 6.5% had a female householder with no husband present, 2.9% had a male householder with no wife present, and 28.3% were non-families. 24.1% of all households were made up of individuals and 11.8% had someone living alone who was 65 years of age or older. The average household size was 2.48 and the average family size was 2.97.
The median age in the city was 46 years. 24.6% of residents were under the age of 18; 4.8% were between the ages of 18 and 24; 19% were from 25 to 44; 32% were from 45 to 64; and 19.5% were 65 years of age or older. The gender makeup of the city was 48.7% male and 51.3% female.