#1 Best Private High Schools in Charleston County, SC
Ashley Hall School
Independent school · Grades Pre-K–12
The smallest classes of any independent school in Charleston
Charleston, SC
A+Overall grade543 students6 students per teacher
2026 lists
Best Private High Schools in Charleston County, SC
Private high schools in Charleston County, SC with the highest overall grades. Top 7 of 7 schools.
#2 Best Private High Schools in Charleston County, SC
Porter-Gaud School
Episcopal school · Grades 1–12
The largest Christian school in Charleston
Charleston, SC
A+Overall grade1,071 students9 students per teacher
#3 Best Private High Schools in Charleston County, SC
Northside Christian School
Baptist school · Grades Pre-K–12
90% of graduates go to four-year colleges
North Charleston, SC
A+Overall grade227 students10 students per teacher
#4 Best Private High Schools in Charleston County, SC
Charleston Collegiate School
Independent school · Grades Pre-K–12
95% of graduates go to four-year colleges
Johns Island, SC
A+Overall grade363 students8 students per teacher
#5 Best Private High Schools in Charleston County, SC
Palmetto Christian Academy
Baptist school · Grades Pre-K–12
93% of graduates go to four-year colleges
Mount Pleasant, SC
BOverall grade678 students12 students per teacher
#6 Best Private High Schools in Charleston County, SC
First Baptist School of Charleston
Baptist school · Grades Pre-K–12
Serving families in Charleston since at least 2011
Charleston, SC
B-Overall grade501 students12 students per teacher
#7 Best Private High Schools in Charleston County, SC
Palmetto Christian Academy
Baptist school · Grades Pre-K–12
97% of graduates go to four-year colleges
Mount Pleasant, SC
B-Overall grade677 students12 students per teacher
Grades compare each school's official facts, such as class size, how long it has served families and where graduates go, with similar schools. They're a starting point: visit, ask questions and trust what you see.