At a glance
Reported students
1,439
NCES CCD 2024–25
Teachers (FTE)
76.38
NCES CCD 2024–25
Student–teacher ratio
18.8:1
Calculated; not a class-size measure
Grades served
09–12
NCES preliminary directory 2025–26
School benchmarks
Washington high enrollment
84th percentile
Compared with 624 same-level schools reporting enrollment.
District median enrollment
416
Mercer Island High School: 1,439 reported students.
State peer staffing position
44th percentile
18.8:1 reported; state peer median 19.9:1. Ratio is not class size.
Historical enrollment and staffing · CRDC 2021–22
These older figures are kept separate from 2024–25 statistics and benchmarks. Differences between years can reflect changes in enrollment, staffing, or reporting scope.
- Students
- 1,555
- Teachers (FTE)
- 75.34
- Student–teacher ratio
- 20.6:1
What the reported data says about Mercer Island High School
Mercer Island High School is a public high school serving grades 09–12 in Mercer Island. It is one of 6 current school records connected to Mercer Island School District. NCES reports 1,439 students for 2024–25.
Among 624 high schools in Washington with comparable records, this school is larger than the reported median of 225 students. Its enrollment is at approximately the 84th percentile for that peer group. Size describes the campus, not instructional quality.
The reported student–teacher ratio is 18.8:1, close to the Washington median of 19.9:1 for the same school level. This ratio uses total enrollment and teacher FTE; it is not an average classroom headcount and can be affected by special programs or part-time staffing.
The largest reported race and ethnicity groups are White (51.6%) and Asian (25.2%). English learners represent 1.1% of enrollment. Students served under IDEA represent 10.9%. These figures help families understand who the school serves; they are not rating inputs.
The 2021–22 civil-rights collection reports AP student enrollment, gifted and talented programming. The school reported 29 AP courses. Program availability changes, so families should confirm the current catalog and participation rules directly with the school.
Questions worth asking Mercer Island High School
- 1How do the reported 18.8:1 student–teacher ratio and 76.38 teacher FTE translate into actual class sizes by grade?
- 2Have the reported academic programs changed since the 2021–22 CRDC collection?
- 3What counseling support is available today? The school reported 4.92 counselor FTE in 2021–22.
- 4What meal assistance, transportation, after-school, and family-support services are currently available?
Enrollment needs
- English learners
- 1.1%
- Students with disabilities
- 10.9%
- Free/reduced-price lunch
- 7.1%
- Lunch program
- No
Reported support staff
- Counselors (FTE)
- 4.92
- Nurses (FTE)
- 0.98
- Psychologists (FTE)
- 1.48
- Social workers (FTE)
- 0
CRDC 2021–22 full-time-equivalent counts; verify current assignments with the school.
Student demographics
Race and ethnicity share of reported enrollment
- White51.6%
- Hispanic7.1%
- Black1.4%
- Asian25.2%
- American Indian / Alaska Native0.1%
- Native Hawaiian / Pacific Islander0.3%
- Multiracial13.3%
Race/ethnicity: NCES CCD 2024–25. English learner and disability context: CRDC 2021–22. Lunch eligibility: NCES CCD 2024–25. Privacy rules can produce missing values.
Programs reported by the school
AP student enrollment
Students enrolled
29 distinct courses reported
Gifted and talented
Offered
Computer science
Not reported as offered
CRDC 2021–22: the AP flag records student enrollment; gifted and computer-science fields describe reported programs/classes. Confirm current courses and eligibility with the school.
Other schools in Mercer Island School District
Start with campuses at the same school level or with similar reported enrollment.
Islander Middle School
Middle · Grades 06–08
960 reported students
West Mercer Elementary
Elementary · Grades KG–05
431 reported students
Lakeridge Elementary School
Elementary · Grades KG–05
401 reported students
Northwood Elementary School
Elementary · Grades PK–05
398 reported students
Island Park Elementary
Elementary · Grades KG–05
364 reported students
Public schools near Mercer Island High School
Closest campuses by straight-line distance between NCES geocodes, favoring the same school level. Distance is not drive time or an attendance assignment.
| School | Grades | Students | Distance |
|---|---|---|---|
| Newport Senior High School High · Bellevue School District | 09–12 | 1,850 | 2.2 mi |
| Bellevue High School High · Bellevue School District | 09–12 | 1,683 | 2.4 mi |
| International School High · Bellevue School District | 06–12 | 600 | 3.2 mi |
| Bellevue Open Doors Reengagement High · Bellevue School District | 10–12 | 24 | 3.3 mi |
| Interagency Open Doors High · Seattle School District No. 1 | 09–12 | 132 | 3.3 mi |
| Franklin High School High · Seattle School District No. 1 | 09–12 | 1,277 | 3.4 mi |
Frequently asked questions about Mercer Island High School
What grades does Mercer Island High School serve?
Mercer Island High School reports grades 09–12 in the NCES 2025–26 preliminary directory. It is classified as a high school in Mercer Island School District.
How many students attend Mercer Island High School?
Mercer Island High School reported 1,439 students in the NCES 2024–25 membership file. That places it near the 84th percentile among 624 Washington high schools reporting enrollment. The 2021–22 civil-rights collection recorded 1,555 students.
What is the student–teacher ratio at Mercer Island High School?
The calculated ratio is 18.8:1, based on 1,439 students and 76.38 full-time-equivalent classroom teachers in 2024–25. The Washington median for the same school level is 19.9:1. A ratio is not the same as average class size.
Is Mercer Island High School a public, charter, or magnet school?
Mercer Island High School is a public school and is not a charter school. Enrollment is generally based on Mercer Island School District attendance boundaries and transfer rules.
What share of Mercer Island High School students qualify for free or reduced-price meals?
7.1% of students were eligible for free or reduced-price lunch in 2024–25. This describes the students served and is not a quality measure.
Which school district is Mercer Island High School in?
Mercer Island High School is part of Mercer Island School District, based in Mercer Island, WA, which operates 6 current schools. Confirm attendance zones and enrollment rules with the district.
What public schools are near Mercer Island High School?
The closest public schools by straight-line distance include Newport Senior High School (2.2 mi), Bellevue High School (2.4 mi), International School (3.2 mi). Distance does not determine eligibility; attendance boundaries and program rules do.