#1 Largest Private Schools in St. Tammany Parish, LA
Northlake Christian
Christian school (nondenominational) · Grades K–12
922 students
Covington, LA
B-Overall grade922 students
2026 lists
Largest Private Schools in St. Tammany Parish, LA
The private schools in St. Tammany Parish, LA with the most students. Top 15 of 15 schools.
#2 Largest Private Schools in St. Tammany Parish, LA
St. Pauls High School
Independent Catholic school · Grades 8–12
865 students
Covington, LA
AOverall gradeAll boys865 students13 students per teacher
#3 Largest Private Schools in St. Tammany Parish, LA
St. Peter Catholic School
Diocesan school · Grades Pre-K–7
706 students
Covington, LA
B-Overall grade706 students17 students per teacher
#4 Largest Private Schools in St. Tammany Parish, LA
Archbishop Hannan High School
Diocesan school · Grades 8–12
694 students
Covington, LA
B+Overall grade694 students15 students per teacher
#5 Largest Private Schools in St. Tammany Parish, LA
Christ Episcopal School
Episcopal school · Grades Pre-K–12
595 students
Covington, LA
AOverall grade595 students9 students per teacher
#6 Largest Private Schools in St. Tammany Parish, LA
St. Scholastica Academy
Diocesan school · Grades 8–12
538 students
Covington, LA
AOverall gradeAll girls538 students14 students per teacher
#7 Largest Private Schools in St. Tammany Parish, LA
Pope John Paul II Catholic High School
Diocesan school · Grades 8–12
357 students
Slidell, LA
B+Overall grade357 students14 students per teacher
#8 Largest Private Schools in St. Tammany Parish, LA
Mary Queen of Peace Catholic School
Diocesan school · Grades Pre-K–7
350 students
Mandeville, LA
B-Overall grade350 students19 students per teacher
#9 Largest Private Schools in St. Tammany Parish, LA
Lake Castle Slidell Private School
Independent Catholic school · Grades Pre-K–8
336 students
Slidell, LA
B-Overall grade336 students16 students per teacher
#10 Largest Private Schools in St. Tammany Parish, LA
Our Lady of Lourdes Elementary School
Diocesan school · Grades Pre-K–7
301 students
Slidell, LA
BOverall grade301 students15 students per teacher
#11 Largest Private Schools in St. Tammany Parish, LA
First Baptist Christian School
Baptist school · Grades 1–12
278 students
Slidell, LA
B-Overall grade278 students15 students per teacher
#12 Largest Private Schools in St. Tammany Parish, LA
Lakeside Christian Academy
Christian school (nondenominational) · Grades Pre-K–12
154 students
Slidell, LA
A+Overall grade154 students6 students per teacher
#13 Largest Private Schools in St. Tammany Parish, LA
Cedarwood School
Independent school · Grades Pre-K–7
138 students
Mandeville, LA
BOverall grade138 students7 students per teacher
#14 Largest Private Schools in St. Tammany Parish, LA
Southern Magnolia Montessori School
Montessori school · Grades Pre-K–6
32 students
Abita Springs, LA
A-Overall grade32 students6 students per teacher
#15 Largest Private Schools in St. Tammany Parish, LA
Slidell Christian Academy
Christian school (nondenominational) · Grades Pre-K–6
24 students
Slidell, LA
AOverall grade24 students5 students per teacher
From official public records, updated October 2026.