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For the 2026 school year, there are 6 public schools serving 3,975 students in Mercer Island, WA (there are , serving 1,073 private students). 79% of all K-12 students in Mercer Island, WA are educated in public schools (compared to the WA state average of 90%). Mercer Island has one of the highest concentrations of top-ranked public schools in Washington.

The top-ranked public schools in Mercer Island, WA are Island Park Elementary School, Lakeridge Elementary School and Mercer Island High School. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.

Mercer Island, WA public schools have an average math proficiency score of 79% (versus the Washington public school average of 41%), and reading proficiency score of 85% (versus the 53% statewide average). Schools in Mercer Island have an average ranking of 10/10, which is in the top 1% of Washington public schools.

Minority enrollment is 51% of the student body (majority Asian), which is less than the Washington public school average of 52% (majority Hispanic).