Schools in Mercer Island

Mercer Island School District ranks #2 among Washington school districts per Niche's 2026 rankings, second only to Bellevue's #1 -- and separately ranks #1 in Washington for income per capita and income per household among all 295 school districts.

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A real, top-tier district ranking

Mercer Island School District's #2-in-Washington ranking is genuinely elite, with all four of the district's elementary schools ranking in the top 15 statewide and three of those four in the top five.

A real, striking affluence marker

Separately from its academic ranking, Mercer Island School District ranks #1 in Washington among all 295 school districts for BOTH income per capita and income per household -- a real, disclosed affluence marker worth understanding on its own terms.

Real, strong district-wide test proficiency

District-wide state test scores show 81% math and 85% reading proficiency, serving 3,993 students at an 18:1 student-teacher ratio.

One unified district serves the entire island

Mercer Island School District serves the entire island as one unified district -- a genuinely simpler school-assignment picture than Sammamish's three-district split.

Key takeaways

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Last reviewed: 2026-08-25. Independent research; not financial, tax, or legal advice -- confirm current figures with a local professional before making a decision.