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For the 2025-26 school year, there is 1 public middle school serving 938 students in Mercer Island, WA. The top ranked public middle school in Mercer Island, WA is Islander Middle School. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.

Mercer Island, WA public middle school have an average math proficiency score of 74% (versus the Washington public middle school average of 37%), and reading proficiency score of 80% (versus the 51% statewide average). Middle schools in Mercer Island have an average ranking of 10/10, which is in the top 1% of Washington public middle schools.

Minority enrollment is 52% of the student body (majority Asian), which is more than the Washington public middle school average of 50% (majority Hispanic).