Islander Middle School
Mercer Island, WA · Middle School · Grades 6-8
Islander Middle School is a middle school in Mercer Island, WA with 930 students enrolled and a 77% proficiency rate. Part of Mercer Island School District. NCES data from the U.S. Department of Education.
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About This School
Islander Middle School is a middle school located in Mercer Island, Washington. The school serves 930 students in grades 6-8. The student-to-teacher ratio is 20.2:1.
According to EDFacts assessment data, 77% of students meet grade-level proficiency standards in combined math and reading.
5% of students qualify for free or reduced-price lunch.
Islander Middle School is part of the Mercer Island School District in Washington.
How This School Compares
Islander Middle School has 930 students enrolled, making it larger than the average school in Mercer Island School District (676 students). Its 77% proficiency rate is 8 percentage points above the district average of 69%. Compared to the Washington state average of 49%, the school performs 28 points higher. The 20.2:1 student-teacher ratio is above the national average of 16:1.
Frequently Asked Questions
Islander Middle School has 930 students enrolled in grades 6-8. The student-to-teacher ratio is 20.2:1.
According to EDFacts data, 77% of students at Islander Middle School meet grade-level proficiency standards in combined math and reading assessments.
Islander Middle School is part of the Mercer Island School District in Mercer Island, Washington. You can view all schools in this district on the district page.
All data on this page comes from the National Center for Education Statistics (NCES) Common Core of Data and EDFacts assessment results. These are official federal datasets published by the U.S. Department of Education.
School profiles are built from NCES directory data and EDFacts assessment results. Proficiency rates reflect combined math and reading performance. Graduation rates are reported for high schools with available data.
The this entity record above pulls directly from NCES Common Core of Data and EDFacts. What follows is the per-entity context — how this entity sits in the broader U.S. K-12 school outcomes and enrollment distribution and which underlying factors drive the headline numbers.
The methodology behind every numeric value on this page is publicly documented on the NCES Common Core of Data and EDFacts 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.
For readers using this page as a decision input, the related-entity pages elsewhere on the site provide the comparison set. The most useful comparison for this entity is typically a peer within U.S. public schools and districts with similar size, similar exposure, or similar geography — not the national-level summary alone.
Source: NCES Common Core of Data, 2026.