Ellerna is built in Vancouver, on the traditional, ancestral and unceded territories of the xʷməθkʷəy̓əm (Musqueam), Sḵwx̱wú7mesh (Squamish) and səl̓ilw̓ətaʔɬ (Tsleil-Waututh) Nations.

Cornerstone Montessori School

Private School · Elementary · Kindergarten · Sumner

Out-of-school care, kindergarten · Out-of-school care, grade 1 to age 12

Unclaimed

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Where

Address: 1644 GAULT ST
Sumner WA 98390
Get directions
Phone: (253) 987-7239
Website: Not available

Who it is for

Type: Private school
School type: Nonsectarian
Age groups: Out-of-school care, kindergarten, Out-of-school care, grade 1 to age 12
Grades: Pre-kindergarten to grade 6

School details

Enrollment: 41

About this listing

From the Private School Universe Survey 2023-24 (National Center for Education Statistics), imported on October 10, 2026. U.S. Department of Education, National Center for Education Statistics, Private School Universe Survey (PSS), 2023–24.

Dataset: US Dept of Education NCES – Private School Universe Survey 2023-24

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