For the 2026 school year, there are 2 private elementary schools serving 735 students in Mercer Island, WA.
The top-ranked private elementary schools in Mercer Island, WA include St. Monica Catholic School and French American School of Puget Sound.
The average acceptance rate is 60%, which is lower than the Washington private elementary school average acceptance rate of 81%.
50% of private elementary schools in Mercer Island, WA are religiously affiliated (most commonly Catholic).
Top-Ranked Mercer Island Private Elementary Schools (2026)
School
Location
Quick Facts
3795 East Mercer Way
Mercer Island, WA 98040
(206) 275-3533
Mercer Island, WA 98040
(206) 275-3533
Gr: PK-8 | 473 students Avg. class size: 18 students Sports: 5 Tuition & acceptance rate listed
4320 87th Avenue SE
Mercer Island, WA 98040
(206) 232-5432
Mercer Island, WA 98040
(206) 232-5432
Gr: NS-12 | 262 students Avg. class size: 21 students Sports: 4 | Extracurrculars: 17 Tuition & acceptance rate listed
Mercer Island, Washington Private Schools (Closed)
School
Location
Quick Facts
American Academy (Closed 2015)
(Christian)
7834 Se 32nd St
Mercer Island, WA 98040
(206) 230-5672
Mercer Island, WA 98040
(206) 230-5672
Gr: 1-12 | 25 students
Overview
This Town (Mercer Island)
This State (WA)
# Schools
2 Schools
Student Body:
# Students
735 Students
101,739 Students
% Average Students of Color
17%
31%
Academics and Faculty:
# Teachers
20 Teachers
8,540 Teachers
Average Student-Teacher Ratio
13:1
12:1
Average Class Size
20 students
16 students
Tuition and Acceptance Rate:
Average Yearly Tuition Cost
$25,750
$15,457
Average % on Financial Aid
22%
27%
Average Acceptance Rate
60%
81%
Average Endowment Size
$2 million
$42.24 million
Students by Ethnicity:
Diversity Score
0.70
0.64
# American Indian Students
2 Students
1,107 Students
% American Indian Students
n/a
1%
# Asian Students
38 Students
7,871 Students
% Asian Students
5%
8%
# Hispanic Students
297 Students
5,483 Students
% Hispanic Students
40%
5%
# Black Students
20 Students
3,181 Students
% Black Students
3%
3%
# White Students
227 Students
52,042 Students
% White Students
31%
52%
# Hawaiian Students
n/a
538 Students
% Hawaiian Students
n/a
1%
# Two or more races Students
n/a
n/a
% of Two or more races Students
n/a
n/a
# Others Students
151 Students
30,510 Students
% of Others Students
21%
30%
All Ethnic Groups
Extracurriculars and Sports:
Average Number of Extracurriculars
17 extracurriculars
8 extracurriculars
Average Number of Sports
5 sports
5 sports
Frequently Asked Questions
What are the top-ranked private elementary schools in Mercer Island, WA?
The top-ranked private elementary schools in Mercer Island, WA include St. Monica Catholic School and French American School of Puget Sound.
How many private elementary schools are located in Mercer Island?
2 private elementary schools are located in Mercer Island.
What percentage of private elementary schools are religiously affiliated in Mercer Island?
50% of private elementary schools in Mercer Island are religiously affiliated (most commonly Catholic).
Recent Articles
How to Ask About Staff Screening Without Apologizing
Parents should feel comfortable asking how private schools screen employees. Learn which questions matter, what answers to expect, and why transparency about hiring and student safety is a hallmark of a well-managed school.
What Facility Safety Tells You About School Oversight
A school's facilities reveal far more than appearance. Learn how building maintenance, emergency preparedness, and campus safety practices can help parents evaluate school leadership, oversight, and long-term commitment to student well-being.
Is the School Legally a School? A Parent Verification Checklist
Before enrolling your child in a private school, learn how to verify that it is legally operating, properly accredited, and authorized to issue recognized diplomas with this practical parent checklist for making a confident school choice.