#1 Largest Private Schools in Portland, OR
Jesuit High School
Independent Catholic school · Grades 9–12
1,279 students
Portland, OR
AOverall grade1,279 students13 students per teacher
2026 lists
Largest Private Schools in Portland, OR
The private schools in Portland, OR with the most students. Top 50 of 56 schools.
#2 Largest Private Schools in Portland, OR
Central Catholic High School
Diocesan school · Grades 9–12
865 students
Portland, OR
B+Overall grade865 students15 students per teacher
#3 Largest Private Schools in Portland, OR
Catlin Gabel School
Independent school · Grades Pre-K–12
767 students
Portland, OR
B+Overall grade767 students33 students per teacher
#4 Largest Private Schools in Portland, OR
Catlin Gabel
Independent school · Grades Pre-K–12
763 students
Portland, OR
A+Overall grade763 students8 students per teacher
#5 Largest Private Schools in Portland, OR
Portland Christian Schools
Christian school (nondenominational) · Grades Pre-K–12
628 students
Portland, OR
AOverall grade628 students14 students per teacher
#6 Largest Private Schools in Portland, OR
St. Marys Academy
Independent Catholic school · Grades 9–12
606 students
Portland, OR
A-Overall gradeAll girls606 students12 students per teacher
#7 Largest Private Schools in Portland, OR
St. Pius X School
Diocesan school · Grades K–8
513 students
Portland, OR
A+Overall grade513 students8 students per teacher
#8 Largest Private Schools in Portland, OR
French International School of Oregon
Independent school · Grades Pre-K–8
451 students
Portland, OR
AOverall grade451 students7 students per teacher
#9 Largest Private Schools in Portland, OR
Rosemary Anderson High School/Portland Oic
Alternative school · Grades 6–12
326 students
Portland, OR
B-Overall grade326 students14 students per teacher
#10 Largest Private Schools in Portland, OR
Columbia Christian Schools
Church of Christ school · Grades Pre-K–12
322 students
Portland, OR
B+Overall grade322 students13 students per teacher
#11 Largest Private Schools in Portland, OR
Portland Christian Elementary School
Christian school (nondenominational) · Grades Pre-K–5
322 students
Portland, OR
B-Overall grade322 students17 students per teacher
#12 Largest Private Schools in Portland, OR
West Hills Christian School
Christian school (nondenominational) · Grades K–8
322 students
Portland, OR
BOverall grade322 students13 students per teacher
#13 Largest Private Schools in Portland, OR
International School of Portland
Independent school · Grades Pre-K–5
290 students
Portland, OR
A+Overall grade290 students8 students per teacher
#14 Largest Private Schools in Portland, OR
The Madeleine Elementary School
Diocesan school · Grades K–8
256 students
Portland, OR
BOverall grade256 students18 students per teacher
#15 Largest Private Schools in Portland, OR
Holy Redeemer Catholic School
Diocesan school · Grades Pre-K–8
236 students
Portland, OR
A-Overall grade236 students16 students per teacher
#16 Largest Private Schools in Portland, OR
St. Clare School
Diocesan school · Grades K–8
228 students
Portland, OR
BOverall grade228 students15 students per teacher
#17 Largest Private Schools in Portland, OR
Franciscan Montessori Earth School
Independent Catholic school · Grades Pre-K–8
228 students
Portland, OR
B+Overall grade228 students16 students per teacher
#18 Largest Private Schools in Portland, OR
De La Salle North Catholic High School
Independent Catholic school · Grades 9–12
220 students
Portland, OR
AOverall grade220 students12 students per teacher
#19 Largest Private Schools in Portland, OR
Holy Cross Catholic School
Parish school · Grades Pre-K–8
215 students
Portland, OR
A+Overall grade215 students14 students per teacher
#20 Largest Private Schools in Portland, OR
Cedarwood Waldorf School
Independent school · Grades Pre-K–8
215 students
Portland, OR
BOverall grade215 students11 students per teacher
#21 Largest Private Schools in Portland, OR
St. John Fisher
Parish school · Grades Pre-K–8
204 students
Portland, OR
A+Overall grade204 students9 students per teacher
#22 Largest Private Schools in Portland, OR
St. Ignatius School
Diocesan school · Grades Pre-K–8
196 students
Portland, OR
AOverall grade196 students15 students per teacher
#23 Largest Private Schools in Portland, OR
St. Therese Catholic School
Diocesan school · Grades Pre-K–8
195 students
Portland, OR
B+Overall grade195 students18 students per teacher
#24 Largest Private Schools in Portland, OR
St. Rose School
Parish school · Grades Pre-K–8
194 students
Portland, OR
A+Overall grade194 students9 students per teacher
From official public records, updated October 2026.