#1 Best Private Middle Schools in King County, WA
Forest Ridge School of the Sacred Heart
Independent Catholic school · Grades 5–12
The only all-girls school in Bellevue
Bellevue, WA
A+Overall gradeAll girls245 students7 students per teacher
2026 lists
Best Private Middle Schools in King County, WA
Private schools in King County, WA with middle-school grades and the highest overall grades. Top 50 of 89 schools.
#2 Best Private Middle Schools in King County, WA
St. Therese Catholic Academy
Diocesan school · Grades K–8
Smaller classes than 93% of Catholic schools in Washington
Seattle, WA
A+Overall grade198 students8 students per teacher
#3 Best Private Middle Schools in King County, WA
St. Madeleine Sophie Catholic School
Diocesan school · Grades Pre-K–8
Smaller classes than 86% of Catholic schools in Washington
Bellevue, WA
A+Overall grade144 students9 students per teacher
#4 Best Private Middle Schools in King County, WA
Heritage Christian Academy
Baptist school · Grades Pre-K–10
Smaller classes than 89% of Christian schools in Washington
Bothell, WA
A+Overall grade253 students8 students per teacher
#5 Best Private Middle Schools in King County, WA
Villa Academy
Independent Catholic school · Grades Pre-K–8
Smaller classes than 82% of Catholic schools in Washington
Seattle, WA
A+Overall grade298 students9 students per teacher
#6 Best Private Middle Schools in King County, WA
St. Joseph School-- Issaquah and Snoqualmie
Diocesan school · Grades Pre-K–7
The only Catholic school in Issaquah
Issaquah, WA
A+Overall grade165 students6 students per teacher
#7 Best Private Middle Schools in King County, WA
Holy Family Catholic School
Diocesan school · Grades Pre-K–8
The only Catholic school in Auburn
Auburn, WA
A+Overall grade173 students12 students per teacher
#8 Best Private Middle Schools in King County, WA
Shoreline Christian School
Christian school (nondenominational) · Grades Pre-K–12
Smaller classes than 86% of Christian schools in Washington
Shoreline, WA
A+Overall grade224 students8 students per teacher
#9 Best Private Middle Schools in King County, WA
Renton Prep Christian School
Lutheran (Missouri Synod) school · Grades Pre-K–10
The smallest classes of any Christian school in Renton
Renton, WA
A+Overall grade165 students8 students per teacher
#10 Best Private Middle Schools in King County, WA
The Northwest School of the Arts
Independent school · Grades 6–12
99% of graduates go to four-year colleges
Seattle, WA
A+Overall grade429 students8 students per teacher
#11 Best Private Middle Schools in King County, WA
Eastside Christian School
Christian school (nondenominational) · Grades Pre-K–8
Smaller classes than 66% of Christian schools in Washington
Bellevue, WA
A+Overall grade239 students10 students per teacher
#12 Best Private Middle Schools in King County, WA
Rainier Christian School District
Christian school (nondenominational) · Grades Pre-K–12
The smallest classes of any Christian school in Auburn
Auburn, WA
A+Overall grade274 students8 students per teacher
#13 Best Private Middle Schools in King County, WA
The Bear Creek School
Christian school (nondenominational) · Grades Pre-K–12
The only Christian school in Redmond
Redmond, WA
A+Overall grade673 students8 students per teacher
#14 Best Private Middle Schools in King County, WA
Woodinville Montessori School
Montessori school · Grades Pre-K–12
The largest of 37 Montessori schools in Washington
Bothell, WA
A+Overall grade312 students7 students per teacher
#15 Best Private Middle Schools in King County, WA
The Bush School
Independent school · Grades K–12
One of the 3 largest independent schools in Washington
Seattle, WA
A+Overall grade715 students9 students per teacher
#16 Best Private Middle Schools in King County, WA
Medina Academy
Islamic school · Grades Pre-K–8
Growing: enrollment up 78% since 2011–12
Bellevue, WA
A+Overall grade229 students11 students per teacher
#17 Best Private Middle Schools in King County, WA
French American School of Puget Sound
Independent school · Grades Pre-K–8
The largest independent school in Mercer Island
Mercer Island, WA
A+Overall grade312 students5 students per teacher
#18 Best Private Middle Schools in King County, WA
University Prep
Independent school · Grades 6–12
One of the 3 largest independent schools in Washington
Seattle, WA
A+Overall grade662 students8 students per teacher
#19 Best Private Middle Schools in King County, WA
St. Benedict School
Diocesan school · Grades Pre-K–8
Serving families in Seattle since at least 2011
Seattle, WA
A+Overall grade186 students12 students per teacher
#20 Best Private Middle Schools in King County, WA
St. Vincent De Paul School
Parish school · Grades Pre-K–8
One of the most diverse private schools in Washington
Federal Way, WA
A+Overall grade232 students14 students per teacher
#21 Best Private Middle Schools in King County, WA
Summit Classical Christian School
Christian school (nondenominational) · Grades K–12
Smaller classes than 90% of Christian schools in Washington
Bellevue, WA
A+Overall grade275 students7 students per teacher
#22 Best Private Middle Schools in King County, WA
St. Luke School
Diocesan school · Grades Pre-K–8
The only Catholic school in Shoreline
Shoreline, WA
A+Overall grade367 students13 students per teacher
#23 Best Private Middle Schools in King County, WA
Eastside Preparatory School
Independent school · Grades 5–12
100% of graduates go to four-year colleges
Kirkland, WA
A+Overall grade536 students9 students per teacher
#24 Best Private Middle Schools in King County, WA
Cedar River Montessori School
Montessori school · Grades Pre-K–8
The only Montessori school in Renton
Renton, WA
A+Overall grade79 students6 students per teacher
Grades compare each school's official facts, such as class size, how long it has served families and where graduates go, with similar schools. They're a starting point: visit, ask questions and trust what you see.