#1 Best Private High Schools in Delaware
St. Andrew's School
Episcopal school · Grades 9–12
One of the 3 largest Christian schools in Delaware
Middletown, DE
A+Overall grade320 students6 students per teacher
2026 lists
Best Private High Schools in Delaware
Private high schools in Delaware with the highest overall grades. Top 10 of 10 schools.
#2 Best Private High Schools in Delaware
The Tatnall School
Independent school · Grades Pre-K–12
One of the 3 largest independent schools in Delaware
Wilmington, DE
A+Overall grade457 students6 students per teacher
#3 Best Private High Schools in Delaware
Padua Academy
Diocesan school · Grades 9–12
100% of graduates go to four-year colleges
Wilmington, DE
A+Overall gradeAll girls424 students11 students per teacher
#4 Best Private High Schools in Delaware
Centerville Layton School
Independent school · Grades K–12
Smaller classes than 91% of independent schools nationwide
Wilmington, DE
AOverall grade88 students3 students per teacher
#5 Best Private High Schools in Delaware
Red Lion Christian Academy
Christian school (nondenominational) · Grades K–12
The largest of 25 Christian schools in Delaware
Bear, DE
AOverall grade695 students10 students per teacher
#6 Best Private High Schools in Delaware
Aquinas Academy
Independent Catholic school · Grades K–12
The only Catholic school in Bear
Bear, DE
B+Overall grade75 students9 students per teacher
#7 Best Private High Schools in Delaware
Delmarva Christian High School
Christian school (nondenominational) · Grades 9–12
98% of graduates go to four-year colleges
Georgetown, DE
BOverall grade198 students12 students per teacher
#8 Best Private High Schools in Delaware
St. Mark's High School
Diocesan school · Grades 9–12
The largest of 15 Catholic schools in Delaware
Wilmington, DE
BOverall grade829 students17 students per teacher
#9 Best Private High Schools in Delaware
St. Elizabeth School
Diocesan school · Grades Pre-K–12
One of the most diverse private schools in Delaware
Wilmington, DE
BOverall grade364 students12 students per teacher
#10 Best Private High Schools in Delaware
Greenwood Mennonite School
Mennonite school · Grades Pre-K–12
Growing: enrollment up 55% since 2011–12
Greenwood, DE
B-Overall grade296 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.