#1 College-Bound Private High Schools in New Castle County, DE
The Tatnall School
Independent school · Grades Pre-K–12
100% of graduates go to four-year colleges
Wilmington, DE
A+Overall grade457 students6 students per teacher
2026 lists
College-Bound Private High Schools in New Castle County, DE
Private high schools in New Castle County, DE where the most graduates go on to four-year colleges. Top 8 of 8 schools.
#2 College-Bound Private High Schools in New Castle County, DE
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
#3 College-Bound Private High Schools in New Castle County, DE
St. Andrew's School
Episcopal school · Grades 9–12
100% of graduates go to four-year colleges
Middletown, DE
A+Overall grade320 students6 students per teacher
#4 College-Bound Private High Schools in New Castle County, DE
St. Mark's High School
Diocesan school · Grades 9–12
99% of graduates go to four-year colleges
Wilmington, DE
BOverall grade829 students17 students per teacher
#5 College-Bound Private High Schools in New Castle County, DE
Red Lion Christian Academy
Christian school (nondenominational) · Grades K–12
75% of graduates go to four-year colleges
Bear, DE
AOverall grade695 students10 students per teacher
#6 College-Bound Private High Schools in New Castle County, DE
St. Elizabeth School
Diocesan school · Grades Pre-K–12
75% of graduates go to four-year colleges
Wilmington, DE
BOverall grade364 students12 students per teacher
#7 College-Bound Private High Schools in New Castle County, DE
Urban Promise Academy
Christian school (nondenominational) · Grades 8–12
57% of graduates go to four-year colleges
Wilmington, DE
A-Overall grade25 students4 students per teacher
#8 College-Bound Private High Schools in New Castle County, DE
Aquinas Academy
Independent Catholic school · Grades K–12
50% of graduates go to four-year colleges
Bear, DE
B+Overall grade75 students9 students per teacher
From official public records, updated October 2026.