- Enrollment
- 960
- Students per teacher
- 20.9:1
- Resource Index
- 51/100
High school (grades 9-12) · Mercer Island, WA
Mercer Island High School
Federal NCES profile for Mercer Island High School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 52/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 530498000761
👥 S:T ratio 22
🌟 Gifted program 70
🎓 Counselors 42
📋 Attendance 74
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Mercer Island High School earns 52/100 on the Resource Investment Index, with class sizes larger than 75% of Washington schools. It is also one of the largest schools in Washington.
- #5 of 6
- public schools in Mercer Island · Resource Index
- 52
- Resource Index · Higher
- 19.4:1
- large classes for Washington
- 4.5%
- free-lunch eligible
Mercer Island High School has class sizes larger than 75% of Washington schools. Computed live against every Washington school reporting to NCES.
By Resource Investment Index, Mercer Island High School ranks #5 of 6 public schools in Mercer Island, WA.
School address
District: Mercer Island School District · Washington
NCES ID 530498000761 Verify on NCES CCD record →
CCD year-over-year · 2022-23 → 2023-24
-59 students YoY
Mercer Island High School held near 1,465 students from 2022-23 to 2023-24 (-59 headcount).
Teacher FTE held 74.5 → 74.6 across the same CCD years.
Source: NCES Common Core of Data public-school universe (2022-23, 2023-24).
Steady CCD campus
-59 students YoY 530498000761 · Mercer Island, WA High · MID · TRAD
1,439 enr · 19.4:1 · 4.5% lunch · RII 52
Nearest enrollment peer: Islander Middle School (960 students)
Mercer Island High School held near 1,465 students from 2022-23 to 2023-24 (-59 headcount). Teacher FTE held 74.5 → 74.6 across the same CCD years. Read with this school → · District book → · Washington schools → · Find another →
Mercer Island High School in the enrollment neighbourhood
Fall enrollment among this campus and nearest district peers
- This school
Mercer Island High School
1,439 students
- Islander Middl
Islander Middle School
960 students
- West Mercer El 431
West Mercer Elementary
431 students
- Lakeridge Elem 401
Lakeridge Elementary School
401 students
- Northwood Elem 398
Northwood Elementary School
398 students
- Island Park El 364
Island Park Elementary
364 students
What this shows Mercer Island High School reports 1,439 students on the CCD universe file.
How Mercer Island High School compares
Mercer Island High School held steady on CCD headcount: ratios and free-lunch share vs Washington and U.S. means.
| Metric | This school | vs Washington | Washington avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 19.4:1 | ▲ 10% | 17.6:1 | 15.7:1 |
| Free-lunch eligible | 4.5% | ▼ 90% | 45.0% | 51.7% |
| Enrollment | 1,439 | top 4% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
19.4:1
Leaner classes than 18% of US schools, heavier class loads than most.
1,439
Bigger than 96% of US schools by enrollment, a large campus nationally.
Equity indicators methodology
Economic need
4.5%
free-lunch eligible
- 90% below the Washington average of 45.0%
Below the 40% Title I threshold, among the lower-need profiles in the state; federal aid targets individual qualifying students rather than schoolwide programs.
Staffing depth
19.4:1
students per teacher
- 10% above state mean
Top 75% in Washington - lower ratio than 25% of state schools
Between 16:1 and 20:1, squarely in the typical U.S. public-school staffing range.
Engagement
10.4%
chronically absent (missed 10%+ of school days)
In the 10-15% range, above the pre-pandemic national baseline but within the broader post-pandemic picture.
Funding equity
$17,288
per pupil, district-wide
- below Washington avg of $20,912
Close to the U.S. public-school average per-pupil spend.
Support staff
Counselors4.9 FTE
Per 292 students, the combined health-and-guidance staffing load for this school.
Discipline context
4
in-school suspensions + 6 out-of-school
Suspension rate: 0.3 per 100 students. Combined in-school and out-of-school rate: 0.7 per 100 students. Reported via the Civil Rights Data Collection.
Student demographics
White 52.1%
Asian 25.4%
Two or More 13.5%
Hispanic or Latino 7.2%
African American 1.4%
Native Hawaiian / Pacific Islander 0.4%
American Indian / Alaska Native 0.1%
Largest group: White at 52.1% of enrollment.
Student-body diversity index 64.0/100
Simpson diversity index - at 64.0, Mercer Island High School is more mixed than the Washington school average of 53.3.
Programs
AP courses offered 29
Gifted & talented Yes
District finance for Mercer Island School District reports $17,288 per pupil (NCES F-33) - open the district page for the full revenue mix.
How Mercer Island High School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Islander Middle School | Smaller | Similar economic need | Higher S:T ratio |
| West Mercer Elementary | Smaller | Similar economic need | Similar S:T ratio |
| Lakeridge Elementary School | Smaller | Similar economic need | Similar S:T ratio |
| Northwood Elementary School | Smaller | Similar economic need | Lower S:T ratio |
| Island Park Elementary | Smaller | Similar economic need | Lower S:T ratio |
Comparisons are relative to Mercer Island High School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 431
- Students per teacher
- 18.7:1
- Resource Index
- 62/100
- Enrollment
- 401
- Students per teacher
- 19.1:1
- Resource Index
- 62/100
- Enrollment
- 398
- Students per teacher
- 15.3:1
- Resource Index
- 66/100
- Enrollment
- 364
- Students per teacher
- 15.8:1
- Resource Index
- 65/100
Nationwide high schools with similar size or staffing
Out-of-state peers matched by enrollment and by student-teacher ratio, not the same-city or same-district lists above.
Similar enrollment (~1,439 students)
Frequently asked questions about Mercer Island High School
How many students attend Mercer Island High School?
Mercer Island High School has 1,439 students enrolled. It is a high school in Mercer Island, WA. CCD year-over-year: 1,524 (2022-23) → 1,465 (2023-24), nearly flat (-59).
What is the student-teacher ratio at Mercer Island High School?
The student-teacher ratio at Mercer Island High School is 19.4:1, which is 10% higher than the Washington average of 17.6:1 and 24% higher than the national average of 15.7:1.
What percentage of students receive free lunch at Mercer Island High School?
4.5% of students at Mercer Island High School are eligible for free lunch, compared to the Washington average of 45.0%.
What is the racial and ethnic makeup of Mercer Island High School?
The largest demographic group at Mercer Island High School is White at 52.1% of enrollment, in Mercer Island, WA. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 64.0/100.
What is the Resource Investment Index for Mercer Island High School?
Mercer Island High School has a Resource Investment Index of 52/100 (higher reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, gifted-program reporting, counselor availability, chronic absenteeism. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Mercer Island High School rank among public schools in Mercer Island?
By Resource Investment Index, Mercer Island High School ranks #5 of 6 public schools in Mercer Island, WA. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all public schools in Mercer Island on the city page.
What other schools are in Mercer Island School District?
Besides Mercer Island High School, Mercer Island School District also operates Islander Middle School (960 students), West Mercer Elementary (431 students), and Lakeridge Elementary School (401 students). See the Mercer Island School District district page for the complete list.