Public schools in Mercer Island, WA
6 open public schools with an address in Mercer Island, operated by 1 education agency. Compare size, staffing, grade spans, and school type, then confirm assignment with the district.
Public schools
6
NCES preliminary directory 2025–26
Reported students
3,993
6 schools reporting · NCES 2024–25
Median student–teacher ratio
16.9:1
Washington median 16.7:1
Charter schools
0
0 virtual
An overview of Mercer Island public schools
The federal directory lists 6 public schools in Mercer Island, WA: 4 elementary, 1 middle, 1 high. The 6 schools that reported 2024–25 membership enrolled 3,993 students, an average of 666 per school. The largest campus is Mercer Island High School (1,439 students), and the largest elementary school is West Mercer Elementary (431).
Every listed school belongs to Mercer Island School District. City names come from school mailing addresses, which often differ from district or municipal boundaries.
Across schools that reported staffing, the median student–teacher ratio is 16.9:1, similar to the statewide school median of 16.7:1. A ratio counts classroom-teacher FTE against total enrollment, so specialized programs and part-time staffing can move it; ask schools for actual class sizes by grade.
About 7% of students in reporting schools were eligible for free or reduced-price meals in 2024–25. This describes the community served; it is not a quality signal, and community-eligibility schools can report differently.
School districts and agencies serving Mercer Island
Elementary schools in Mercer Island
4| School | Grades | Students | Ratio | Compare |
|---|---|---|---|---|
| Island Park Elementary Mercer Island School District | KG–05 | 364 | 14.9:1 | |
| Lakeridge Elementary School Mercer Island School District | KG–05 | 401 | 17.2:1 | |
| Northwood Elementary School Mercer Island School District | PK–05 | 398 | 15:1 | |
| West Mercer Elementary Mercer Island School District | KG–05 | 431 | 16.5:1 |
Middle schools in Mercer Island
1| School | Grades | Students | Ratio | Compare |
|---|---|---|---|---|
| Islander Middle School Mercer Island School District | 06–08 | 960 | 21.3:1 |
High schools in Mercer Island
1| School | Grades | Students | Ratio | Compare |
|---|---|---|---|---|
| Mercer Island High School Mercer Island School District | 09–12 | 1,439 | 18.8:1 |
Student demographics
Race and ethnicity share of reported enrollment
- White48.1%
- Hispanic7.4%
- Black1.2%
- Asian27.9%
- American Indian / Alaska Native0.1%
- Native Hawaiian / Pacific Islander0.1%
- Multiracial14.4%
Enrollment-weighted across 6 Mercer Island schools with NCES CCD 2024–25 race/ethnicity counts (3,993 students). Privacy suppression can leave small gaps.
Questions about public schools in Mercer Island
How many public schools are in Mercer Island, WA?
The current NCES directory lists 6 open public schools with a location address in Mercer Island: 4 elementary, 1 middle, 1 high. Together they reported 3,993 students in 2024–25. The count includes charter, alternative, and special-purpose public schools; it excludes private schools.
Which school districts serve Mercer Island?
All listed public schools with an address in Mercer Island belong to Mercer Island School District. Mailing cities do not always match district boundaries, so confirm the district for a specific home address.
What is the largest public high school in Mercer Island?
Mercer Island High School reported the largest high-school enrollment in Mercer Island, with 1,439 students in 2024–25 (grades 09–12). Size is a description of the campus, not a quality measure.
Are there charter schools in Mercer Island?
No school with an address in Mercer Island is identified as a charter school in the current NCES directory. Families may still have charter or virtual options elsewhere in Washington.
What is the typical student–teacher ratio in Mercer Island schools?
The median reported student–teacher ratio across Mercer Island public schools is 16.9:1, similar to the Washington school median of 16.7:1. The ratio divides enrollment by classroom-teacher FTE; it is not an average class size.
Does living in Mercer Island guarantee a seat at a specific school?
No. Assignment depends on the district's attendance boundaries, programs, and enrollment rules, which can split a city or cross city lines. Use the district profile and its official boundary or school-locator tool to confirm the assigned school for an exact address.
Nearby Washington cities
Sources: NCES Common Core of Data 2025–26 preliminary directory (schools, grades, addresses, charter status) and 2024–25 nonfiscal files (enrollment, teachers, race/ethnicity, meal eligibility); Civil Rights Data Collection 2021–22 (AP and computer science). Cities are grouped by school mailing address. Methodology · All Washington cities