Mercer Island School District
MERCER ISLAND, Washington · 4,057 students · 6 schools
Enrollment
4,057
Schools
6
Location
MERCER ISLAND, Washington
Schools in this district
Mercer Island High SchoolMercer Island, WA
1,524 students
Islander Middle SchoolMercer Island, WA
930 students
Methodology & sources
- NCES Common Core of Data (CCD) directory
- U.S. Dept. of Education EDFacts assessment results
- Washington accountability framework (per-indicator). Washington publishes per-indicator dashboard ratings instead of a single rollup grade — this projection is a COSMIQ composite over math+ELA proficiency, not an official state rating. Cross-check the state dashboard for the per-indicator view. (as of 2026-05-27)
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Start learning free →About this profile. COSMIQ is an independent, free AI tutoring service and is not affiliated with, endorsed by, or sponsored by Mercer Island School District, Washington, or any government education agency. All figures are drawn from public U.S. Department of Education data (NCES Common Core of Data and EDFacts). Any projected rating is an independent estimate, not an official score. COSMIQ does not collect or publish user reviews or ratings of schools.
Data last refreshed July 7, 2026.