Cornerstone Montessori School
PrivateElementaryGrades PK–6Nonsectarian
1644 Gault St, Sumner, WA 98390 · (253) 987-7239
Sumner’s School Grade A better than 88% of Washington school districts
Students
130
Students per teacher
19:1
Setting
Suburb
Grades
PK–6
What stands out about Cornerstone Montessori School
- Private school: it doesn’t take Washington’s state tests
Location
Directions ↗1644 Gault St, Sumner
Students
Enrollment by grade
Pre-K89
Kindergarten9
Grade 17
Grade 211
Grade 35
Grade 44
Grade 54
Grade 61
Who goes here
Two or more races 44%White 39%Asian 7%American Indian/Alaska Native 5%Hispanic 2%Native Hawaiian/Pacific Islander 2%
As reported to NCES, share of students with a reported race or ethnicity.
Parents talk
Questions and answers about Cornerstone Montessori School from Sumner families.
School facts: U.S. Department of Education (NCES), 2023–2024 school year. Map: © OpenStreetMap contributors.