Mercer Island School District

Mercer Island School District serves about 3,993 students in six public schools spanning prekindergarten through grade 12 on Mercer Island: four elementary schools, one middle school, and one high school. The district is ranked first among 238 Washington districts in the supplied data, and all six schools carry five-star ratings. Overall, families can expect performance well above Washington averages, although results vary by school, grade, and subject.

The strongest elementary results come from Lakeridge Elementary School and Island Park Elementary. Lakeridge ranks fourth statewide and has the district’s highest elementary ELA and math results, at 91.35% and 88.39%. Island Park ranks ninth and is especially balanced, with strong ELA, math, and science results and consistently top-10 rankings. West Mercer Elementary ranks 24th statewide and stands out for math proficiency of 86.54%, which improved substantially from the prior year. Northwood Elementary School remains highly ranked at 59th and improved from the previous year, but its ELA and math results trail the other elementary schools; fourth grade is its clearest area for attention.

Mercer Island High School ranks second statewide, reports a 96.1% graduation rate, and has particularly strong ELA and science results. Its math performance remains excellent compared with Washington but is somewhat lower than the district’s best elementary results. Islander Middle School ranks ninth statewide and substantially exceeds state averages in every reported subject, though it falls below the district’s unusually high averages, especially in science. Families should also note that some science and grade-level figures are suppressed, so comparisons using those results are incomplete. Spending and student-teacher ratios differ across schools, but the data does not show a simple relationship between resources and achievement.