#1 Private Schools with the Smallest Classes in Union County, NJ
Flexschool
Independent school · Grades K–12
3.3 students per teacher
Berkeley Heights, NJ
A+Overall grade98 students3 students per teacher
2026 lists
Private Schools with the Smallest Classes in Union County, NJ
Private schools in Union County, NJ with the fewest students per teacher (not counting preschools and special education schools). Top 18 of 18 schools.
#2 Private Schools with the Smallest Classes in Union County, NJ
Bruriah High School for Girls
Jewish day school · Grades 6–12
4.2 students per teacher
Elizabeth, NJ
A+Overall gradeAll girls213 students4 students per teacher
#3 Private Schools with the Smallest Classes in Union County, NJ
Salahuddin Future Academy, Plainfield Branch
Islamic school · Grades Pre-K–12
4.8 students per teacher
Plainfield, NJ
B+Overall grade70 students5 students per teacher
#4 Private Schools with the Smallest Classes in Union County, NJ
Oak Knoll School of the Holy Child
Independent Catholic school · Grades Pre-K–12
6.4 students per teacher
Summit, NJ
A+Overall grade498 students6 students per teacher
#5 Private Schools with the Smallest Classes in Union County, NJ
Kent Place School
Independent school · Grades Pre-K–12
6.8 students per teacher
Summit, NJ
A+Overall gradeAll girls636 students7 students per teacher
#6 Private Schools with the Smallest Classes in Union County, NJ
Jewish Educational Center Lower School
Jewish day school · Grades Pre-K–5
8.2 students per teacher
Elizabeth, NJ
BOverall grade221 students8 students per teacher
#7 Private Schools with the Smallest Classes in Union County, NJ
Mother Seton Regional High School
Diocesan school · Grades 9–12
8.4 students per teacher
Clark, NJ
A+Overall gradeAll girls181 students8 students per teacher
#8 Private Schools with the Smallest Classes in Union County, NJ
Academy of Our Lady of Peace
Parish school · Grades Pre-K–8
8.7 students per teacher
New Providence, NJ
A+Overall grade125 students9 students per teacher
#9 Private Schools with the Smallest Classes in Union County, NJ
Oratory Prep School
Independent Catholic school · Grades 7–12
9.4 students per teacher
Summit, NJ
A+Overall gradeAll boys363 students9 students per teacher
#10 Private Schools with the Smallest Classes in Union County, NJ
Union Catholic Regional High School
Diocesan school · Grades 9–12
9.5 students per teacher
Scotch Plains, NJ
A+Overall grade530 students10 students per teacher
#11 Private Schools with the Smallest Classes in Union County, NJ
Sinai Christian Academy
Christian school (nondenominational) · Grades Pre-K–11
9.6 students per teacher
Linden, NJ
A-Overall grade67 students10 students per teacher
#12 Private Schools with the Smallest Classes in Union County, NJ
Harmony Christian Academy
Christian school (nondenominational) · Grades Pre-K–11
10.4 students per teacher
Elizabethport, NJ
BOverall grade83 students10 students per teacher
#13 Private Schools with the Smallest Classes in Union County, NJ
St. Bartholomew Academy
Parish school · Grades Pre-K–8
10.5 students per teacher
Scotch Plains, NJ
A+Overall grade157 students11 students per teacher
#14 Private Schools with the Smallest Classes in Union County, NJ
Holy Trinity
Diocesan school · Grades Pre-K–8
11.5 students per teacher
Westfield, NJ
AOverall grade303 students12 students per teacher
#15 Private Schools with the Smallest Classes in Union County, NJ
St. Joseph the Carpenter School
Diocesan school · Grades Pre-K–8
12.3 students per teacher
Roselle, NJ
AOverall grade160 students12 students per teacher
#16 Private Schools with the Smallest Classes in Union County, NJ
Rav Teitz Mesivta Academy (Jec High School)
Jewish day school · Grades 6–12
14 students per teacher
Elizabeth, NJ
B-Overall gradeAll boys210 students14 students per teacher
#17 Private Schools with the Smallest Classes in Union County, NJ
St. Michael Parish School
Parish school · Grades Pre-K–8
14.8 students per teacher
Union, NJ
B+Overall grade329 students15 students per teacher
#18 Private Schools with the Smallest Classes in Union County, NJ
St. Michael School
Diocesan school · Grades Pre-K–8
15.6 students per teacher
Cranford, NJ
BOverall grade258 students16 students per teacher
From official public records, updated October 2026.