#1 Fastest-Growing Private Schools in Charleston County, SC
O'Quinn Schools of Porter-Gaud (2 Campuses)
Early childhood program · Grades Pre-K–K
Enrollment up 169% in about a decade
Mount Pleasant, SC
A-Overall grade97 students7 students per teacher
2026 lists
Fastest-Growing Private Schools in Charleston County, SC
Private schools in Charleston County, SC whose enrollment has grown the most over the past decade. Top 9 of 9 schools.
#2 Fastest-Growing Private Schools in Charleston County, SC
The Cooper School
Alternative school · Grades K–8
Enrollment up 135% in about a decade
Charleston, SC
B+Overall grade153 students8 students per teacher
#3 Fastest-Growing Private Schools in Charleston County, SC
Charleston Collegiate School
Independent school · Grades Pre-K–12
Enrollment up 80% in about a decade
Johns Island, SC
A+Overall grade363 students8 students per teacher
#4 Fastest-Growing Private Schools in Charleston County, SC
Sundrops Montessori School
Montessori school · Grades Pre-K–9
Enrollment up 61% in about a decade
Mount Pleasant, SC
A+Overall grade66 students2 students per teacher
#5 Fastest-Growing Private Schools in Charleston County, SC
Palmetto Christian Academy
Baptist school · Grades Pre-K–12
Enrollment up 54% in about a decade
Mount Pleasant, SC
BOverall grade678 students12 students per teacher
#6 Fastest-Growing Private Schools in Charleston County, SC
University School of the Lowcountry
Independent school · Grades 3–12
Enrollment up 27% in about a decade
Mount Pleasant, SC
AOverall grade84 students7 students per teacher
#7 Fastest-Growing Private Schools in Charleston County, SC
Porter-Gaud School
Episcopal school · Grades 1–12
Enrollment up 19% in about a decade
Charleston, SC
A+Overall grade1,071 students9 students per teacher
#8 Fastest-Growing Private Schools in Charleston County, SC
Charleston Day School
Independent school · Grades K–8
Enrollment up 14% in about a decade
Charleston, SC
B+Overall grade246 students7 students per teacher
#9 Fastest-Growing Private Schools in Charleston County, SC
First Baptist School of Charleston
Baptist school · Grades Pre-K–12
Enrollment up 13% in about a decade
Charleston, SC
B-Overall grade501 students12 students per teacher
From official public records, updated October 2026.