#1 Largest Private Schools in Charleston County, 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 County, SC
The private schools in Charleston County, SC with the most students. Top 31 of 31 schools.
#2 Largest Private Schools in Charleston County, SC
Palmetto Christian Academy
Baptist school · Grades Pre-K–12
678 students
Mount Pleasant, SC
BOverall grade678 students12 students per teacher
#3 Largest Private Schools in Charleston County, SC
Palmetto Christian Academy
Baptist school · Grades Pre-K–12
677 students
Mount Pleasant, SC
B-Overall grade677 students12 students per teacher
#4 Largest Private Schools in Charleston County, SC
Christ Our King-Stella Mans School
Parish school · Grades Pre-K–8
602 students
Mount Pleasant, SC
B-Overall grade602 students13 students per teacher
#5 Largest Private Schools in Charleston County, SC
Ashley Hall School
Independent school · Grades Pre-K–12
543 students
Charleston, SC
A+Overall grade543 students6 students per teacher
#6 Largest Private Schools in Charleston County, SC
First Baptist School of Charleston
Baptist school · Grades Pre-K–12
501 students
Charleston, SC
B-Overall grade501 students12 students per teacher
#7 Largest Private Schools in Charleston County, SC
Charleston Collegiate School
Independent school · Grades Pre-K–12
363 students
Johns Island, SC
A+Overall grade363 students8 students per teacher
#8 Largest Private Schools in Charleston County, SC
Mason Preparatory School
Christian school (nondenominational) · Grades K–8
300 students
Charleston, SC
BOverall grade300 students9 students per teacher
#9 Largest Private Schools in Charleston County, SC
Charleston Day School
Independent school · Grades K–8
246 students
Charleston, SC
B+Overall grade246 students7 students per teacher
#10 Largest Private Schools in Charleston County, SC
Blessed Sacrament Catholic School
Diocesan school · Grades Pre-K–8
231 students
Charleston, SC
A-Overall grade231 students10 students per teacher
#11 Largest Private Schools in Charleston County, SC
Northside Christian School
Baptist school · Grades Pre-K–12
227 students
North Charleston, SC
A+Overall grade227 students10 students per teacher
#12 Largest Private Schools in Charleston County, SC
James Island Christian School
Christian school (nondenominational) · Grades Pre-K–8
221 students
Charleston, SC
B-Overall grade221 students8 students per teacher
#13 Largest Private Schools in Charleston County, SC
James Island Christian School
Christian school (nondenominational) · Grades Pre-K–8
218 students
Charleston, SC
B-Overall grade218 students11 students per teacher
#14 Largest Private Schools in Charleston County, SC
Meeting Street Academy
Independent school · Grades Pre-K–5
209 students
Charleston, SC
BOverall grade209 students8 students per teacher
#15 Largest Private Schools in Charleston County, SC
Charleston Bilingual Academy
Christian school (nondenominational) · Grades Pre-K–7
194 students
North Charleston, SC
BOverall grade194 students15 students per teacher
#16 Largest Private Schools in Charleston County, SC
The Charleston Catholic School
Parish school · Grades Pre-K–8
163 students
Charleston, SC
A+Overall grade163 students8 students per teacher
#17 Largest Private Schools in Charleston County, SC
The Cooper School
Alternative school · Grades K–8
153 students
Charleston, SC
B+Overall grade153 students8 students per teacher
#18 Largest Private Schools in Charleston County, SC
O'Quinn Schools of Porter-Gaud (2 Campuses)
Early childhood program · Grades Pre-K–K
97 students
Mount Pleasant, SC
A-Overall grade97 students7 students per teacher
#19 Largest Private Schools in Charleston County, SC
Nativity School
Parish school · Grades Pre-K–8
91 students
Charleston, SC
A+Overall grade91 students7 students per teacher
#20 Largest Private Schools in Charleston County, SC
University School of the Lowcountry
Independent school · Grades 3–12
84 students
Mount Pleasant, SC
AOverall grade84 students7 students per teacher
#21 Largest Private Schools in Charleston County, SC
Sundrops Montessori School
Montessori school · Grades Pre-K–9
66 students
Mount Pleasant, SC
A+Overall grade66 students2 students per teacher
#22 Largest Private Schools in Charleston County, SC
Sundrops Montessori Bridge Campus
Montessori school · Grades Pre-K–9
66 students
Mount Pleasant, SC
BOverall grade66 students11 students per teacher
#23 Largest Private Schools in Charleston County, SC
Addlestone Hebrew Academy
Jewish day school · Grades K–8
61 students
Charleston, SC
AOverall grade61 students4 students per teacher
#24 Largest Private Schools in Charleston County, SC
Addlestone Hebrew Academy
Jewish day school · Grades Pre-K–8
60 students
Charleston, SC
A-Overall grade60 students6 students per teacher
From official public records, updated October 2026.