#1 Best Private High Schools in Charleston, 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, SC
Private high schools in Charleston, SC with the highest overall grades. Top 5 of 5 schools.
#2 Best Private High Schools in Charleston, 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, SC
Bishop England High School
Diocesan school · Grades 9–12
The largest of 30 Catholic schools in South Carolina
Charleston, SC
B+Overall grade718 students12 students per teacher
#4 Best Private High Schools in Charleston, 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
#5 Best Private High Schools in Charleston, SC
Cathedral Academy
Christian school (nondenominational) · Grades Pre-K–12
85% of graduates go to four-year colleges
Charleston, SC
B-Overall grade348 students13 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.