Top Rankings
Mercer Island School District ranks among the top 20% of public school district in Washington for:
Category
Attribute
Overall Rank
Highest overall rank (Top 1%)
Math Proficiency
Highest math proficiency (Top 1%)
Reading/Language Arts Proficiency
Highest reading/language arts proficiency (Top 1%)
Science Proficiency
Highest science proficiency (Top 1%)
Graduation Rate
Highest graduation rate (Top 5%)
Diversity
Most diverse schools (Top 1%)
For the 2025-26 school year, there is 1 public middle school serving 938 students in Mercer Island School District. This district's average middle testing ranking is 10/10, which is in the top 1% of public middle schools in Washington.
Public Middle School in Mercer Island School District have an average math proficiency score of 74% (versus the Washington public middle school average of 37%), and reading proficiency score of 80% (versus the 51% statewide average).
The top ranked public middle school in Mercer Island School District is Islander Middle School. Overall testing rank is based on a school's combined math and reading proficiency test score ranking. Minority enrollment is 52% of the student body (majority Asian), which is more than the Washington public middle school average of 50% (majority Hispanic).
Overview
This School District
This State (WA)
# Schools
6 Schools
799 Schools
# Students
3,975 Students
302,560 Students
# Teachers
217 Teachers
16,189 Teachers
Student-Teacher Ratio
18:1
18:1
Student By Grade
District Rank
Mercer Island School District, which is ranked within the top 1% of all 306 school districts in Washington (based off of combined math and reading proficiency testing data) for the 2022-2023 school year.
The school district's graduation rate of 94% has decreased from 95% over five school years.
Overall District Rank
#1 out of 307 school districts
(Top 1%)
(Top 1%)
Math Test Scores (% Proficient)
79%
41%
Reading/Language Arts Test Scores (% Proficient)
85%
53%
Science Test Scores (% Proficient)
81%
49%
Graduation Rate
94%
84%
Students by Ethnicity:
Diversity Score
0.66
0.68
% American Indian
n/a
2%
% Asian
28%
8%
% Hispanic
7%
25%
% Black
1%
5%
% White
49%
50%
% Hawaiian
n/a
1%
% Two or more races
15%
9%
All Ethnic Groups
District Revenue and Spending
The revenue/student of $20,484 is higher than the state median of $18,796. The school district revenue/student has grown by 5% over four school years.
The school district's spending/student of $18,521 is less than the state median of $19,247. The school district spending/student has grown by 5% over four school years.
Total Revenue
$81 MM
$20,715 MM
Spending
$74 MM
$21,212 MM
Revenue / Student
$20,484
$18,796
Spending / Student
$18,521
$19,247
Best Mercer Island School District Public Middle Schools (2025-26)
School
(Math and Reading Proficiency)
(Math and Reading Proficiency)
Location
Quick Facts
Rank: #11.
Islander Middle School
(Math: 74% | Reading: 80%)
Rank:
Rank:
10/
Top 5%10
8225 Se 72nd
Mercer Island, WA 98040
(206) 236-3413
Mercer Island, WA 98040
(206) 236-3413
Gr: 6-8 | 938 students Student-teacher ratio: 20:1 Minority enrollment: 52%
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