#1 Largest Private Schools in Charleston, SC
Porter-Gaud School
Episcopal school · Grades 1–12
1,071 students
Charleston, SC
A+Overall grade1,071 students9 students per teacher
2026 lists
Largest Private Schools in Charleston, SC
The private schools in Charleston, SC with the most students. Top 20 of 20 schools.
#2 Largest Private Schools in Charleston, SC
Bishop England High School
Diocesan school · Grades 9–12
718 students
Charleston, SC
B+Overall grade718 students12 students per teacher
#3 Largest Private Schools in Charleston, SC
Ashley Hall School
Independent school · Grades Pre-K–12
543 students
Charleston, SC
A+Overall grade543 students6 students per teacher
#4 Largest Private Schools in Charleston, SC
First Baptist School of Charleston
Baptist school · Grades Pre-K–12
501 students
Charleston, SC
B-Overall grade501 students12 students per teacher
#5 Largest Private Schools in Charleston, SC
Cathedral Academy
Christian school (nondenominational) · Grades Pre-K–12
348 students
Charleston, SC
B-Overall grade348 students13 students per teacher
#6 Largest Private Schools in Charleston, SC
Mason Preparatory School
Christian school (nondenominational) · Grades K–8
300 students
Charleston, SC
BOverall grade300 students9 students per teacher
#7 Largest Private Schools in Charleston, SC
Charleston Day School
Independent school · Grades K–8
246 students
Charleston, SC
B+Overall grade246 students7 students per teacher
#8 Largest Private Schools in Charleston, SC
Blessed Sacrament Catholic School
Diocesan school · Grades Pre-K–8
231 students
Charleston, SC
A-Overall grade231 students10 students per teacher
#9 Largest Private Schools in Charleston, SC
James Island Christian School
Christian school (nondenominational) · Grades Pre-K–8
221 students
Charleston, SC
B-Overall grade221 students8 students per teacher
#10 Largest Private Schools in Charleston, SC
James Island Christian School
Christian school (nondenominational) · Grades Pre-K–8
218 students
Charleston, SC
B-Overall grade218 students11 students per teacher
#11 Largest Private Schools in Charleston, SC
Meeting Street Academy
Independent school · Grades Pre-K–5
209 students
Charleston, SC
BOverall grade209 students8 students per teacher
#12 Largest Private Schools in Charleston, SC
The Charleston Catholic School
Parish school · Grades Pre-K–8
163 students
Charleston, SC
A+Overall grade163 students8 students per teacher
#13 Largest Private Schools in Charleston, SC
The Cooper School
Alternative school · Grades K–8
153 students
Charleston, SC
B+Overall grade153 students8 students per teacher
#14 Largest Private Schools in Charleston, SC
Nativity School
Parish school · Grades Pre-K–8
91 students
Charleston, SC
A+Overall grade91 students7 students per teacher
#15 Largest Private Schools in Charleston, SC
Addlestone Hebrew Academy
Jewish day school · Grades K–8
61 students
Charleston, SC
AOverall grade61 students4 students per teacher
#16 Largest Private Schools in Charleston, SC
Addlestone Hebrew Academy
Jewish day school · Grades Pre-K–8
60 students
Charleston, SC
A-Overall grade60 students6 students per teacher
#17 Largest Private Schools in Charleston, SC
Charles Towne Montessori School
Montessori school · Grades Pre-K–6
37 students
Charleston, SC
B+Overall grade37 students8 students per teacher
#18 Largest Private Schools in Charleston, SC
Adventist Christian Academy of Charleston
Seventh-day Adventist school · Grades K–8
29 students
Charleston, SC
A-Overall grade29 students10 students per teacher
#19 Largest Private Schools in Charleston, SC
Trinity Montessori School
Christian (nondenominational) · Montessori · Grades Pre-K–6
22 students
Charleston, SC
AOverall grade22 students3 students per teacher
#20 Largest Private Schools in Charleston, SC
Oak Grove Montessori
Montessori school · Grades Pre-K–K
21 students
Charleston, SC
B+Overall grade21 students21 students per teacher
From official public records, updated October 2026.