Summary:
Mercer Island, Washington, has six public schools serving about 3,993 students from elementary through high school, all part of the highly rated Mercer Island School District. The schools include four elementary schools, one middle school, and one high school, and all available rankings place them among Washington’s strongest schools. The district is ranked first out of 238 Washington districts in the provided data.
Mercer Island High School is the strongest overall secondary school, ranked second out of 396 high schools. It reports a 96.1% graduation rate, a 1.3% dropout rate, and especially strong ELA and science results; math is somewhat lower but still well above the state average. Islander Middle School is also highly ranked, reaching ninth out of 514, with strong ELA and math performance. Science is its clearest opportunity for improvement because it trails the district average. Among elementary schools, Lakeridge Elementary School has the highest current ranking and leads elementary schools in ELA and math, while Island Park Elementary has the most consistently elite rankings and balanced results across all three subjects.
West Mercer Elementary also performs very well, with particularly strong math results and a favorable student–teacher ratio. Northwood Elementary School remains highly ranked statewide but is the main school to monitor locally: its current ELA and math results are the lowest in the district, with notable 4th-grade weaknesses, although science is strong. Parents should also note that some science results are state-suppressed and should not be interpreted as low performance. Overall, Mercer Island offers consistently high achievement, excellent graduation outcomes, and several top-ranked schools, with the most evident improvement opportunities involving Northwood’s ELA and math and science at the middle school.
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