Unified School District · WA
Mercer Island School District
Mercer Island School District is a unified school district in Washington with a community population of 25,307. The median household income is $219,069 and the median age is 46.4.
25,307
Population
3965
People / sq mi
$219,069
Median Income
46.4
Median Age
Mercer Island School District covers 6 sq mi of land at 3964.8 people per square mile.
Race & Ethnicity
| White | 63.6% |
| Black or African American | 0.2% |
| Asian | 48.5% |
| Hispanic or Latino (any race) | 0.0% |
Economy & Income
$219,069
Median Household Income
$128,615
Per Capita Income
2.1%
Poverty Rate
1.8%
Unemployment
Housing
$2,000,001
Median Home Value
$2,502
Median Rent
67.0%
Homeownership
Education Attainment
98.4%
High School+
81.4%
Bachelor's+
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State rankings
Frequently Asked Questions
Mercer Island School District serves a community with a population of 25,307 according to the latest Census ACS 5-Year estimates. This unified school district is located in Washington.
The median household income in Mercer Island School District is $219,069, with a per capita income of $128,615. The poverty rate is 2.1%.
Mercer Island School District is 63.6% White, 0.2% Black or African American, 48.5% Asian, and 0.0% Hispanic or Latino, per Census ACS data.
In Mercer Island School District, 98.4% of adults have a high school diploma or higher, and 81.4% hold a bachelor's degree or higher, per Census ACS estimates.
The median home value in Mercer Island School District is $2,000,001, with a median rent of $2,502. The homeownership rate is 67.0%.
More from Washington
Data for Mercer Island School District from the American Community Survey 5-Year estimates. Land area from Census Gazetteer files. This is a unified school district (GEOID: 5304980).
this entity is one of the data points covered by this site’s U.S. population demographics dataset. The detail above comes directly from the U.S. Census Bureau ACS and decennial files; the context that follows situates the headline numbers against the broader distribution across U.S. states, metros, cities, and ZIPs.
The methodology behind every numeric value on this page is publicly documented on the the U.S. Census Bureau ACS and decennial files portal and described in detail on this site’s methodology page. Refresh cadence varies by underlying series; the page surfaces the as-of date for each number so readers can trace any figure back to the source release.
Practical use of this page is in combination with the comparison and ranking pages elsewhere on the site, which surface the same data for this entity’s peers within U.S. states, metros, cities, and ZIPs. A single-entity reading without peer context can be misleading when an entity is an outlier on one axis but typical on another.
Source: U.S. Census Bureau ACS, 2026.