#1 Largest Private Schools in District of Columbia County, DC
St. Johns College High School
Independent Catholic school · Grades 9–12
1,794 students
Washington, DC
B+Overall grade1,794 students20 students per teacher
2026 lists
Largest Private Schools in District of Columbia County, DC
The private schools in District of Columbia County, DC with the most students. Top 44 of 44 schools.
#2 Largest Private Schools in District of Columbia County, DC
Sidwell Friends School
Quaker (Friends) school · Grades Pre-K–12
1,129 students
Washington, DC
A+Overall grade1,129 students8 students per teacher
#3 Largest Private Schools in District of Columbia County, DC
Sidwell Friends School
Quaker (Friends) school · Grades Pre-K–12
1,123 students
Washington, DC
A+Overall grade1,123 students9 students per teacher
#4 Largest Private Schools in District of Columbia County, DC
Sidwell Friends School
Quaker (Friends) school · Grades Pre-K–12
1,122 students
Washingon, DC
A+Overall grade1,122 students8 students per teacher
#5 Largest Private Schools in District of Columbia County, DC
Washington International School
Independent school · Grades Pre-K–12
846 students
Washington, DC
A+Overall grade846 students7 students per teacher
#6 Largest Private Schools in District of Columbia County, DC
National Cathedral School
Episcopal school · Grades 4–12
597 students
Washington, DC
A+Overall gradeAll girls597 students8 students per teacher
#7 Largest Private Schools in District of Columbia County, DC
Georgetown Visitation Preparatory School
Independent Catholic school · Grades 9–12
512 students
Washington, DC
A+Overall gradeAll girls512 students11 students per teacher
#8 Largest Private Schools in District of Columbia County, DC
Blessed Sacrament School
Parish school · Grades K–8
502 students
Washington, DC
B-Overall grade502 students12 students per teacher
#9 Largest Private Schools in District of Columbia County, DC
Milton Gottesman Jewish Day School of the Nation's
Jewish day school · Grades Pre-K–8
449 students
Washington, DC
BOverall grade449 students8 students per teacher
#10 Largest Private Schools in District of Columbia County, DC
St. Patrick's Episcopal Day School
Episcopal school · Grades Pre-K–8
424 students
Washington, DC
AOverall grade424 students7 students per teacher
#11 Largest Private Schools in District of Columbia County, DC
Archbishop Carroll High School
Diocesan school · Grades 9–12
384 students
Washington, DC
B+Overall grade384 students13 students per teacher
#12 Largest Private Schools in District of Columbia County, DC
The Field School
Independent school · Grades 6–12
351 students
Washington, DC
A+Overall grade351 students7 students per teacher
#13 Largest Private Schools in District of Columbia County, DC
Holy Trinity School
Parish school · Grades Pre-K–8
315 students
Washington, DC
A-Overall grade315 students9 students per teacher
#14 Largest Private Schools in District of Columbia County, DC
Edmund Burke School
Independent school · Grades 6–12
315 students
Washington, DC
A+Overall grade315 students8 students per teacher
#15 Largest Private Schools in District of Columbia County, DC
Beauvoir the National Cathedral Elementary School
Episcopal school · Grades Pre-K–3
313 students
Washington, DC
BOverall grade313 students15 students per teacher
#16 Largest Private Schools in District of Columbia County, DC
Lowell School
Independent school · Grades Pre-K–8
270 students
Washington, DC
A+Overall grade270 students4 students per teacher
#17 Largest Private Schools in District of Columbia County, DC
St. Anselm's Abbey School
Diocesan school · Grades 6–12
224 students
Washington, DC
A+Overall gradeAll boys224 students6 students per teacher
#18 Largest Private Schools in District of Columbia County, DC
Capitol Hill Day School
Independent school · Grades Pre-K–8
221 students
Washington, DC
A+Overall grade221 students4 students per teacher
#19 Largest Private Schools in District of Columbia County, DC
Sheridan School
Independent school · Grades K–8
221 students
Washington, DC
A+Overall grade221 students7 students per teacher
#20 Largest Private Schools in District of Columbia County, DC
St. Peter School
Diocesan school · Grades Pre-K–8
210 students
Washington, DC
A+Overall grade210 students7 students per teacher
#21 Largest Private Schools in District of Columbia County, DC
St. Anthony Catholic School
Parish school · Grades K–8
195 students
Washington, DC
A+Overall grade195 students6 students per teacher
#22 Largest Private Schools in District of Columbia County, DC
Our Lady of Victory School
Diocesan school · Grades Pre-K–8
186 students
Washington, DC
BOverall grade186 students12 students per teacher
#23 Largest Private Schools in District of Columbia County, DC
Sacred Heart School
Diocesan school · Grades Pre-K–8
186 students
Washington, DC
BOverall grade186 students12 students per teacher
#24 Largest Private Schools in District of Columbia County, DC
Cornerstone Schools of Washington, DC
Christian school (nondenominational) · Grades K–12
178 students
Washington, DC
B-Overall grade178 students11 students per teacher
From official public records, updated October 2026.