#1 Largest Private Schools in Wisconsin
Seton Catholic Schools
Independent Catholic school · Grades Pre-K–8
2,624 students
Saint Francis, WI
BOverall grade2,624 students15 students per teacher
2026 lists
Largest Private Schools in Wisconsin
The private schools in Wisconsin with the most students. Top 50 of 641 schools.
#2 Largest Private Schools in Wisconsin
Green Bay Area Catholic Edu. INC Grace
Diocesan school · Grades Pre-K–11
2,001 students
Green Bay, WI
B+Overall grade2,001 students12 students per teacher
#3 Largest Private Schools in Wisconsin
Green Bay Area Catholic Education
Diocesan school · Grades Pre-K–11
2,001 students
Green Bay, WI
B+Overall grade2,001 students12 students per teacher
#4 Largest Private Schools in Wisconsin
Green Bay Area Catholic Education
Diocesan school · Grades Pre-K–11
2,001 students
Green Bay, WI
B+Overall grade2,001 students12 students per teacher
#5 Largest Private Schools in Wisconsin
St. Augustine Preparatory Academy
Christian school (nondenominational) · Grades Pre-K–12
1,759 students
Milwaukee, WI
B-Overall grade1,759 students15 students per teacher
#6 Largest Private Schools in Wisconsin
St. Anthony School
Parish school · Grades Pre-K–12
1,436 students
Milwaukee, WI
B-Overall grade1,436 students17 students per teacher
#7 Largest Private Schools in Wisconsin
Siena Catholic Schools of Racine
Diocesan school · Grades Pre-K–12
1,435 students
Racine, WI
BOverall grade1,435 students13 students per teacher
#8 Largest Private Schools in Wisconsin
St. Francis Xavier Catholic School System
Parish school · Grades Pre-K–12
1,280 students
Appleton, WI
B-Overall grade1,280 students15 students per teacher
#9 Largest Private Schools in Wisconsin
Messmer Catholic Schools
Independent Catholic school · Grades Pre-K–12
1,180 students
Milwaukee, WI
B-Overall grade1,180 students14 students per teacher
#10 Largest Private Schools in Wisconsin
Messmer Catholic Schools
Independent Catholic school · Grades K–12
1,018 students
Milwaukee, WI
BOverall grade1,018 students13 students per teacher
#11 Largest Private Schools in Wisconsin
Salam School
Islamic school · Grades Pre-K–12
985 students
Milwaukee, WI
AOverall grade985 students9 students per teacher
#12 Largest Private Schools in Wisconsin
Freedomproject Academy
Christian school (nondenominational) · Grades K–12
972 students
Appleton, WI
B-Overall grade972 students15 students per teacher
#13 Largest Private Schools in Wisconsin
St. Marcus Lutheran School
Lutheran (Wisconsin Synod) school · Grades Pre-K–8
956 students
Milwaukee, WI
B-Overall grade956 students18 students per teacher
#14 Largest Private Schools in Wisconsin
Aquinas Catholic Schools
Diocesan school · Grades K–12
954 students
La Crosse, WI
B+Overall grade954 students9 students per teacher
#15 Largest Private Schools in Wisconsin
Milwaukee Lutheran High School
Lutheran (Missouri Synod) school · Grades 9–12
934 students
Milwaukee, WI
B-Overall grade934 students18 students per teacher
#16 Largest Private Schools in Wisconsin
Wisconsin Lutheran High School
Lutheran (Wisconsin Synod) school · Grades 9–12
921 students
Milwaukee, WI
A-Overall grade921 students12 students per teacher
#17 Largest Private Schools in Wisconsin
Marquette University High School
Independent Catholic school · Grades 9–12
893 students
Milwaukee, WI
B+Overall gradeAll boys893 students15 students per teacher
#18 Largest Private Schools in Wisconsin
St. Mary Catholic Middle School
Diocesan school · Grades Pre-K–12
850 students
Neenah, WI
A+Overall grade850 students8 students per teacher
#19 Largest Private Schools in Wisconsin
St. Marys Springs Academy
Diocesan school · Grades Pre-K–12
815 students
Fond du Lac, WI
B-Overall grade815 students14 students per teacher
#20 Largest Private Schools in Wisconsin
Shining Star Christian Schools
Christian school (nondenominational) · Grades Pre-K–9
777 students
Milwaukee, WI
B-Overall grade777 students27 students per teacher
#21 Largest Private Schools in Wisconsin
Regis Catholic Schools
Diocesan school · Grades Pre-K–12
768 students
Eau Claire, WI
B-Overall grade768 students14 students per teacher
#22 Largest Private Schools in Wisconsin
Fox Valley Lutheran High School
Lutheran (Wisconsin Synod) school · Grades 9–12
745 students
Appleton, WI
BOverall grade745 students14 students per teacher
#23 Largest Private Schools in Wisconsin
St. Joseph Catholic Academy
Diocesan school · Grades Pre-K–12
742 students
Kenosha, WI
BOverall grade742 students14 students per teacher
#24 Largest Private Schools in Wisconsin
Notre Dame De La Baie Academy
Independent Catholic school · Grades 9–12
739 students
Green Bay, WI
BOverall grade739 students13 students per teacher
From official public records, updated October 2026.