Private School Review - Established 2003

Sumner Private Schools

For the 2026-27 school year, there is 1 private school serving 115 students in Sumner, WA, 2% of all K-12 students in Sumner, WA are educated in private schools versus public schools (compared to the WA state average of 10%).

Quick Facts (26-27)

Quick Facts (26-27)

Private Schools in Sumner, WA (2026-27)

Cornerstone Montessori Photo
Cornerstone Montessori
Gr: NS-6 | 115 students
Avg. class size: 15 students
Extracurriculars: 2
Montessori School
1644 Gault St
Sumner, WA 98390
(253) 987-7239
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Sumner, WA Private School Trends

1
Private Schools
115
Students
15
Avg. Class Size
29%
Students of Color
14:1
Student-Teacher Ratio
Download town snapshot: CSV | XML | JSON Data may not be displayed on any public-facing website or service that replicates or resembles a school search or review portal without prior written permission.
Enrollment & Diversity
Category
This Town (Sumner)
This State (WA)
# Schools
1 School
788 Schools
# Students
115 Students
118,689 Students
% Students of Color
29%
32%
0.22
0.64
Show more data/charts: racial breakdown
# American Indian Students
0 Students
1,226 Students
% American Indian Students
0%
1%
# Asian Students
3 Students
9,040 Students
% Asian Students
2%
8%
# Hispanic Students
0 Students
6,302 Students
% Hispanic Students
0%
5%
# Black Students
1 Student
3,815 Students
% Black Students
1%
3%
# White Students
10 Students
59,127 Students
% White Students
9%
50%
# Hawaiian Students
0 Students
651 Students
% Hawaiian Students
0%
1%
# Others Students
101 Students
37,081 Students
% of Others Students
88%
32%
All Ethnic Groups
Academics
# Teachers
8 Teachers
10,044 Teachers
Average Student-Teacher Ratio
14:1
12:1
% Average Faculty w/Advanced Degree
30%
59%
Average Class Size
15 students
15 students
Tuition & Aid
Average Summer Program Cost
$990
$846
Admissions & Athletics
Average Number of Extracurriculars
2 extracurriculars
8 extracurriculars

Frequently Asked Questions

How many private schools are located in Sumner, WA?
1 private schools are located in Sumner, WA.
What percentage of students in Sumner go to private school?
2% of all K-12 students in Sumner are educated in private schools (compared to the WA state average of 10%).

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