Islander Middle School

Islander Middle School operates as a high-enrollment 6-8 campus in Mercer Island, Washington, overseen by Mercer Island School District. Current enrollment sits at 960 students spanning grades 6 through 8. Enrollment runs roughly 66% above the state mean of about 577.

Islander Middle School is one of 6 schools operated by Mercer Island School District, a district that hosts 3,993 students overall.

For racial and ethnic makeup, Islander Middle School lists that the largest single group is White at 46%, but no single group is in the majority. Other groups include 32% Asian, 13% multiracial, 8% Hispanic. The wider county runs roughly 55% White, putting the school's mix noticeably less White than the area baseline.

In terms of school funding signals, On paper, Islander Middle School has 45 full-time-equivalent teachers, translating to a class-load average of around 21.3:1. Statewide, the average ratio sits near 18.9:1, putting Islander Middle School higher than the state norm the norm. About 8% of enrolled students meet the income threshold for free or reduced-price lunch, which schools and policymakers use as a rough income-mix signal. By comparison, King County runs at roughly 38%, so the school's eligibility rate is below the surrounding baseline.

With demographic context factored in, Islander Middle School sits in the middle band of the BeatsExpectations distribution. Schools with this campus's student mix typically land near 75.0%; this one delivers 74.4%.

In the surrounding community, ACS estimates for King County put the typical household earns roughly $124,746 per year, 57% of adults hold a bachelor's degree or higher, and census figures put the poverty rate at about 5%. In all, King County runs 544 public schools (combined enrollment of about 278,492 students), of which Islander Middle School is one.

Lakeridge Elementary School is the nearest neighboring public school, about 0.4 miles from this campus. 8 of the 8 nearest public schools sit inside a five-mile radius. Among the 9 schools in that immediate cluster with test data (this one included), Islander Middle School ranks 3rd on composite proficiency, ahead of the local average of 54.5%.

The campus sits in a suburban setting.

Trend over the last 7 years. Over the past 7-year window, the student count contracted 16%: 1,146 students in 2018 compared to 960 in 2025. The White share of enrollment fell from 66% to 46% over that span.

On allk12, the page collects discussion, questions, and updates around science fair prep, picture-day reminders, and bus-route questions. Posting is open to anyone connected to the school.