#1 Largest Private Schools in Wilmington, DE
St. Mark's High School
Diocesan school · Grades 9–12
829 students
Wilmington, DE
BOverall grade829 students17 students per teacher
2026 lists
Largest Private Schools in Wilmington, DE
The private schools in Wilmington, DE with the most students. Top 22 of 22 schools.
#2 Largest Private Schools in Wilmington, DE
St. Mary Magdalen School
Parish school · Grades Pre-K–8
467 students
Wilmington, DE
B+Overall grade467 students13 students per teacher
#3 Largest Private Schools in Wilmington, DE
St. John the Beloved School
Parish school · Grades Pre-K–8
459 students
Wilmington, DE
B-Overall grade459 students18 students per teacher
#4 Largest Private Schools in Wilmington, DE
The Tatnall School
Independent school · Grades Pre-K–12
457 students
Wilmington, DE
A+Overall grade457 students6 students per teacher
#5 Largest Private Schools in Wilmington, DE
Ursuline Academy, Lower
Independent Catholic school · Grades 3–8
456 students
Wilmington, DE
A+Overall grade456 students8 students per teacher
#6 Largest Private Schools in Wilmington, DE
Padua Academy
Diocesan school · Grades 9–12
424 students
Wilmington, DE
A+Overall gradeAll girls424 students11 students per teacher
#7 Largest Private Schools in Wilmington, DE
Immaculate Heart of Mary
Diocesan school · Grades Pre-K–8
406 students
Wilmington, DE
B-Overall grade406 students16 students per teacher
#8 Largest Private Schools in Wilmington, DE
St. Elizabeth School
Diocesan school · Grades Pre-K–12
364 students
Wilmington, DE
BOverall grade364 students12 students per teacher
#9 Largest Private Schools in Wilmington, DE
St. Ann School
Parish school · Grades Pre-K–8
200 students
Wilmington, DE
BOverall grade200 students16 students per teacher
#10 Largest Private Schools in Wilmington, DE
St. Anthony of Padua Grade School
Diocesan school · Grades Pre-K–8
161 students
Wilmington, DE
A+Overall grade161 students9 students per teacher
#11 Largest Private Schools in Wilmington, DE
St. Edmond's Academy
Independent Catholic school · Grades Pre-K–8
158 students
Wilmington, DE
A+Overall gradeAll boys158 students9 students per teacher
#12 Largest Private Schools in Wilmington, DE
The Pilot School
Special education school · Grades K–8
136 students
Wilmington, DE
AOverall grade136 students4 students per teacher
#13 Largest Private Schools in Wilmington, DE
Concord Christian Academy
Baptist school · Grades Pre-K–12
136 students
Wilmington, DE
B+Overall grade136 students9 students per teacher
#14 Largest Private Schools in Wilmington, DE
Centerville Layton School
Independent school · Grades K–12
88 students
Wilmington, DE
AOverall grade88 students3 students per teacher
#15 Largest Private Schools in Wilmington, DE
Urban Promise School
Christian school (nondenominational) · Grades Pre-K–12
85 students
Wilmington, DE
AOverall grade85 students6 students per teacher
#16 Largest Private Schools in Wilmington, DE
St. Peter Cathedral School
Parish school · Grades Pre-K–8
65 students
Wilmington, DE
A+Overall grade65 students6 students per teacher
#17 Largest Private Schools in Wilmington, DE
Nativity Preparatory School of Wilmington
Diocesan school · Grades 5–8
53 students
Wilmington, DE
A+Overall gradeAll boys53 students8 students per teacher
#18 Largest Private Schools in Wilmington, DE
Serviam Girls Academy
Christian school (nondenominational) · Grades 5–8
44 students
Wilmington, DE
A+Overall gradeAll girls44 students6 students per teacher
#19 Largest Private Schools in Wilmington, DE
Darul Amaanah Academy
Islamic school · Grades Pre-K–9
34 students
Wilmington, DE
34 students4 students per teacher
#20 Largest Private Schools in Wilmington, DE
Albert Einstein Academy
Jewish day school · Grades K–5
33 students
Wilmington, DE
AOverall grade33 students6 students per teacher
#21 Largest Private Schools in Wilmington, DE
Sharon Temple Adventist School
Seventh-day Adventist school · Grades K–8
33 students
Wilmington, DE
B+Overall grade33 students14 students per teacher
#22 Largest Private Schools in Wilmington, DE
Urban Promise Academy
Christian school (nondenominational) · Grades 8–12
25 students
Wilmington, DE
A-Overall grade25 students4 students per teacher
From official public records, updated October 2026.