#1 Largest Private Schools in King County, WA
King's School
Christian school (nondenominational) · Grades Pre-K–12
1,209 students
Shoreline, WA
A-Overall grade1,209 students14 students per teacher
2026 lists
Largest Private Schools in King County, WA
The private schools in King County, WA with the most students. Top 50 of 173 schools.
#2 Largest Private Schools in King County, WA
King's Schools
Christian school (nondenominational) · Grades Pre-K–12
1,209 students
Seattle, WA
BOverall grade1,209 students14 students per teacher
#3 Largest Private Schools in King County, WA
Seattle Academy
Independent school · Grades 6–12
1,170 students
Seattle, WA
A+Overall grade1,170 students8 students per teacher
#4 Largest Private Schools in King County, WA
Bishop Blanchet High School
Diocesan school · Grades 9–12
922 students
Seattle, WA
A-Overall grade922 students13 students per teacher
#5 Largest Private Schools in King County, WA
John F Kennedy Catholic High School
Diocesan school · Grades 9–12
815 students
Burien, WA
AOverall grade815 students13 students per teacher
#6 Largest Private Schools in King County, WA
The Bush School
Independent school · Grades K–12
715 students
Seattle, WA
A+Overall grade715 students9 students per teacher
#7 Largest Private Schools in King County, WA
Renton Christian School
Assembly of God school · Grades Pre-K–8
690 students
Renton, WA
B+Overall grade690 students16 students per teacher
#8 Largest Private Schools in King County, WA
The Bear Creek School
Christian school (nondenominational) · Grades Pre-K–12
673 students
Redmond, WA
A+Overall grade673 students8 students per teacher
#9 Largest Private Schools in King County, WA
University Prep
Independent school · Grades 6–12
662 students
Seattle, WA
A+Overall grade662 students8 students per teacher
#10 Largest Private Schools in King County, WA
Seattle Christian Schools
Christian school (nondenominational) · Grades K–12
606 students
SeaTac, WA
BOverall grade606 students13 students per teacher
#11 Largest Private Schools in King County, WA
St. Joseph School
Parish school · Grades K–8
575 students
Seattle, WA
AOverall grade575 students14 students per teacher
#12 Largest Private Schools in King County, WA
St. Joseph School
Parish school · Grades K–8
575 students
Seattle, WA
B+Overall grade575 students14 students per teacher
#13 Largest Private Schools in King County, WA
Holy Names Academy
Independent Catholic school · Grades 9–12
571 students
Seattle, WA
BOverall gradeAll girls571 students16 students per teacher
#14 Largest Private Schools in King County, WA
Bellevue Children's Academy
Independent school · Grades Pre-K–4
541 students
Bellevue, WA
B+Overall grade541 students8 students per teacher
#15 Largest Private Schools in King County, WA
Eastside Preparatory School
Independent school · Grades 5–12
536 students
Kirkland, WA
A+Overall grade536 students9 students per teacher
#16 Largest Private Schools in King County, WA
St. Francis of Assisi School
Diocesan school · Grades K–8
479 students
Burien, WA
BOverall grade479 students17 students per teacher
#17 Largest Private Schools in King County, WA
St. John School
Parish school · Grades Pre-K–8
469 students
Seattle, WA
BOverall grade469 students20 students per teacher
#18 Largest Private Schools in King County, WA
Holy Rosary School
Diocesan school · Grades Pre-K–8
465 students
Seattle, WA
BOverall grade465 students16 students per teacher
#19 Largest Private Schools in King County, WA
O'Dea High School
Diocesan school · Grades 9–12
461 students
Seattle, WA
BOverall gradeAll boys461 students14 students per teacher
#20 Largest Private Schools in King County, WA
The Northwest School of the Arts
Independent school · Grades 6–12
429 students
Seattle, WA
A+Overall grade429 students8 students per teacher
#21 Largest Private Schools in King County, WA
Sacred Heart School
Diocesan school · Grades Pre-K–8
408 students
Clyde Hill, WA
AOverall grade408 students13 students per teacher
#22 Largest Private Schools in King County, WA
Hamlin Robinson School
Special education school · Grades 1–8
389 students
Seattle, WA
B+Overall grade389 students7 students per teacher
#23 Largest Private Schools in King County, WA
St. Luke School
Diocesan school · Grades Pre-K–8
367 students
Shoreline, WA
A+Overall grade367 students13 students per teacher
#24 Largest Private Schools in King County, WA
Open Window School
Independent school · Grades K–8
359 students
Bellevue, WA
B+Overall grade359 students11 students per teacher
From official public records, updated October 2026.