Mercer Island High School
#21
Best ACT in Washington High Schools
1,524
Students
20.5:1
S:T Ratio
School Snapshot
Key metrics at a glanceAvg SAT Scoreout of 1600
1,350
A
Excellent
Avg ACT Scoreout of 36
29
A
Excellent
AP Coursescourses offered
29
A+
Excellent
AP Enrollmentof students
37%
C+
Excellent
Student-Teacher Ratiostudents per teacher
21:1
B-
Average
This Week at Mercer Island – April 9, 2026
200 students practicing on Varsity Tutors
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School Details
Address
9100 Se 42nd, Mercer Island, WA 98040
Phone
(206)236-3345
Website
Visit Website
District
Mercer Island School District