Excellent
#174 of 2,228 schools in WA
Top 8% in state
Mercer Island High School
High School · Mercer Island School District · Mercer Island, WA
A high school in Mercer Island, WA where students score 8 points above what's typical for similar communities.
9100 SE 42nd, Mercer Island, WA 98040
- Math 76% vs WA 36% (2024)
- Reading 83% vs WA 56% (2024)
- 5/5 advanced STEM subjects
Academics
Full Profile · 4/4 metricsView breakdown
View breakdown
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Students at Mercer Island High School score 79% proficient, which is above what's typical for similar communities (expected: 72%).
2024 SBA proficiency
Most recent published year. School vs. WA average.
Trend
↓ DecliningProficiency has fallen 15 points since 2018, to 79% in 2024, across a 16-year record (2009–2024).
Show all 13 years
Multi-year averages used by the rating model: math 89% (multi-year average, 2009-2024) · reading/ELA 94% (multi-year average, 2009-2024)
Based on 29 test records from WA state assessments and EdFacts (NCES).
Equity & diversity
Shown separately, not included in the overall scoreFree/reduced lunch
7.2%
Students qualifying for federal meal assistance
How we rate schools
A clear 1–10 score built from public data — growth, academics, and learning environment. No hidden criteria, no pay-to-play.
See how we rateThe neighborhood
Where Mercer Island High School sits, and what the surrounding area looks like.
Nearby same-level schools are colored by their score. Pins are locations, not attendance boundaries. Open the Seattle map →
Getting around & local context
- Walk 43Car-Dependent
- Transit 22Minimal Transit
- Bike 30Somewhat Bikeable
- City Safety: Elevated1,278/100K
Powered by
FBI Uniform Crime Reporting · 2024 · city context (Mercer Island), not school-level safety or attendance eligibility. Source details
Source period: 2024. Freshness not available.
Area profileU.S. Census ACS 5-year estimates (ACS 2019–2023 5-year estimates)
Median income
$202,359
Median home value
$1,884,200
Median rent
$2,464/mo
College educated
78.8%
Homeownership
66%
Poverty rate
4.6%
ACS 2019–2023 5-year estimates for the ZCTA associated with school ZIP 98040; this is area context, not an attendance boundary.
Programs & students
Programs & Offerings
Compare nearby
Nearby same-level schools
3 from a 5-mile search
| School | Score | Grades | Distance | Enrollment | Compare |
|---|---|---|---|---|---|
| Privett AcademyPrivate · tuition | Not rated | 9–12 | 0.5 mi | 2 | Compare → |
| Yellow Wood AcademyPrivate · tuition | 8.2 | 2–12 | 0.6 mi | 115 | Compare → |
| Northwest Yeshiva High SchoolPrivate · tuition | 6.9 | 9–12 | 1.0 mi | 52 | Compare → |
Distance is proximity only; it is not attendance eligibility.
Private · tuition: Potential private option; tuition and admission requirements have not been verified.
Mercer Island School District
- Schools in district
- 6
- Rank in district
- #5 of 6
- District spending per student
- $17,288NCES F-33 · FY 2023 · This annual source is three years behind the current year.
- District child poverty rate
- 2.7%Census SAIPE · 2024
Mercer Island High School is listed in Mercer Island School District; a district label does not verify attendance for an address.
About Mercer Island High School
Mercer Island High School is a public high school in Mercer Island, WA, part of Mercer Island School District, serving approximately 1,465 students in grades 9th-12th with a 19.8:1 student-teacher ratio. It holds a MySchoolScout rating of 8.8 out of 10 and ranks #174 of 2,228 schools in WA. State assessment records show 89% math proficiency (multi-year average, 2009-2024) and 94% reading/ELA proficiency (multi-year average, 2009-2024).
Frequently asked questions
Common questions about Mercer Island High School
What grades does Mercer Island High School serve?
Mercer Island High School serves students in grades 9th through 12th.
How many students attend Mercer Island High School?
Mercer Island High School has an enrollment of approximately 1,465 students.
What is the student-teacher ratio at Mercer Island High School?
The student-teacher ratio at Mercer Island High School is 19.8:1. A lower ratio generally means more individual attention per student. The national average is approximately 16:1 for public schools.
How does Mercer Island High School rank in WA?
Mercer Island High School ranks #174 of 2,228 schools in WA.
What is Mercer Island High School's MySchoolScout rating?
Mercer Island High School has a current MySchoolScout rating of 8.8 out of 10. This score combines the level-appropriate components shown in the rating breakdown; equity data is shown separately for context.
What are the test scores at Mercer Island High School?
Based on loaded state assessment records, Mercer Island High School has 89% math proficiency (multi-year average, 2009-2024) and 94% reading/ELA proficiency (multi-year average, 2009-2024).
Is Mercer Island High School a charter school?
No, Mercer Island High School is not a charter school. It is a traditional public school operated by the local school district.
Is Mercer Island High School a Title I school?
No, Mercer Island High School is not currently a Title I school.
What does the Free & Reduced Lunch percentage mean for Mercer Island High School?
7.2% of students at Mercer Island High School qualify for free or reduced-price lunch. This is a commonly used indicator of economic need and provides important context when interpreting test scores.
School factsNCES Common Core of Data (CCD) (SY 2023–24)
- Grades
- 9th – 12th
- Enrollment
- 1,465
- Student-Teacher Ratio
- 19.8:1
- Teachers (FTE)
- 74
- Type
- regular
- Setting
- Large Suburb
- County
- King County
- Chronic Absenteeism (SY 2022-23)
- 8.4%
- Phone
- (206) 236-3345
- Area population (ZIP 98040)
- 25,282
- Area average commute
- 24.9 min
- Area median age
- 45.8
About this school's data
Every number on this page comes from a published source with a stated period. Where a source is partial, aging, or describes a surrounding area rather than the school, that limitation is named below.
- School directory (enrollment, grades, staff, contact)
- NCES Common Core of Data (CCD) · SY 2023–24 · Medium confidence
- Source period: SY 2023–24. A newer release may be available.
- MySchoolScout rating and rank
- MySchoolScout ranking model · Low confidence
- Vintage not available. Do not use this measure alone.
- Derived as a weighted blend of the component scores shown in Academics from state assessment, EdFacts growth, and NCES resource records.
- Math proficiency
- State department of education · 2024 SBA · Low confidence
- Vintage not available. Do not use this measure alone.
- Available for part of the eligible units; results may not represent the full area.
- Derived from source records rather than read directly from one field.
- Reading/ELA proficiency
- State department of education · 2024 SBA · Low confidence
- Vintage not available. Do not use this measure alone.
- Available for part of the eligible units; results may not represent the full area.
- Derived from source records rather than read directly from one field.
- Student progress (growth)
- NCES EdFacts · Mixed source periods · Low confidence
- Vintage not available. Do not use this measure alone.
- Available for part of the eligible units; results may not represent the full area.
- Derived as the fitted year-over-year slope of proficiency from multi-year assessment records.
- Neighborhood (income, housing, education)
- U.S. Census ACS 5-year estimates · ACS 2019–2023 5-year estimates · Low confidence
- Older source: ACS 2019–2023 5-year estimates. Use as historical context.
- Reported for the ZCTA for ZIP 98040; this does not measure the attendance area.
- Programs (AP/IB, athletics, gifted)
- CRDC via Urban Institute · SY 2021–22 · Medium confidence
- Available for part of the eligible units; results may not represent the full area.
- Source period: SY 2021–22. A newer release may be available.
Evidence periods: Rating mixed/unknown input periods; assessments multi-year average, 2009-2024; directory SY 2023–24
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