Total enrollment
3,993
-536 (-12%) vs SY 2017-18
6 schools in Mercer Island School District
Washington · 3,993 students · 1 city
Public-school families inside Mercer Island School District pick from 6 campuses serving the district's roughly 3,993 K-12 students (4 elementary, 1 middle, and 1 high).
7-year change in Mercer Island School District
SY 2017-18 vs SY 2024-25School count
6
0 (0%) vs SY 2017-18
% Hispanic
7%
was 5%
% Black
1%
was 1%
% Asian
28%
was 21%
Source: NCES Common Core of Data, enrollment-weighted demographic averages
| Name | City | Level | Grades | Enrollment |
|---|---|---|---|---|
| Mercer Island High School | Mercer Island | High | 09-12 | 1,439 |
| Islander Middle School | Mercer Island | Middle | 06-08 | 960 |
| West Mercer Elementary | Mercer Island | Elementary | KG-05 | 431 |
| Lakeridge Elementary School | Mercer Island | Elementary | KG-05 | 401 |
| Northwood Elementary School | Mercer Island | Elementary | PK-05 | 398 |
| Island Park Elementary | Mercer Island | Elementary | KG-05 | 364 |
About Mercer Island School District
Mercer Island School District operates 6 public schools across Washington, collectively enrolling roughly 3,993 students.
In terms of grade levels, Mercer Island School District comprises 4 elementary, 1 middle, and 1 high school.
Per-school enrollment averages around 666 in this district, meaningfully above the Washington typical of 446.
Trend over the past 7 years. Across the same 7-year window, public-school enrollment shrank 12%: 4,529 students in SY 2017-18 versus 3,993 in SY 2024-25. Demographically, the Asian share of enrollment climbed from 21% to 28%.
On allk12, the community for Mercer Island School District discusses comparison threads between local schools and program reviews. Discussions cut across districts, schools, and grade levels.