#1 Best Catholic Schools in Union County, NJ
Mother Seton Regional High School
Diocesan school · Grades 9–12
The only Catholic school in Clark
Clark, NJ
A+Overall gradeAll girls181 students8 students per teacher
2026 lists
Best Catholic Schools in Union County, NJ
The highest-graded schools of this kind in Union County, NJ. Top 10 of 10 schools.
#2 Best Catholic Schools in Union County, NJ
Union Catholic Regional High School
Diocesan school · Grades 9–12
100% of graduates go to four-year colleges
Scotch Plains, NJ
A+Overall grade530 students10 students per teacher
#3 Best Catholic Schools in Union County, NJ
Oak Knoll School of the Holy Child
Independent Catholic school · Grades Pre-K–12
Smaller classes than 85% of Catholic schools nationwide
Summit, NJ
A+Overall grade498 students6 students per teacher
#4 Best Catholic Schools in Union County, NJ
St. Bartholomew Academy
Parish school · Grades Pre-K–8
Smaller classes than 67% of Catholic schools in New Jersey
Scotch Plains, NJ
A+Overall grade157 students11 students per teacher
#5 Best Catholic Schools in Union County, NJ
Academy of Our Lady of Peace
Parish school · Grades Pre-K–8
Smaller classes than 88% of Catholic schools in New Jersey
New Providence, NJ
A+Overall grade125 students9 students per teacher
#6 Best Catholic Schools in Union County, NJ
Oratory Prep School
Independent Catholic school · Grades 7–12
The only all-boys school in Summit
Summit, NJ
A+Overall gradeAll boys363 students9 students per teacher
#7 Best Catholic Schools in Union County, NJ
St. Joseph the Carpenter School
Diocesan school · Grades Pre-K–8
Serving families in Roselle since at least 2011
Roselle, NJ
AOverall grade160 students12 students per teacher
#8 Best Catholic Schools in Union County, NJ
Holy Trinity
Diocesan school · Grades Pre-K–8
The only Catholic school in Westfield
Westfield, NJ
AOverall grade303 students12 students per teacher
#9 Best Catholic Schools in Union County, NJ
St. Michael Parish School
Parish school · Grades Pre-K–8
Serving families in Union since at least 2011
Union, NJ
B+Overall grade329 students15 students per teacher
#10 Best Catholic Schools in Union County, NJ
St. Michael School
Diocesan school · Grades Pre-K–8
The only Catholic school in Cranford
Cranford, NJ
BOverall grade258 students16 students per teacher
Grades compare each school's official facts, such as class size, how long it has served families and where graduates go, with similar schools. They're a starting point: visit, ask questions and trust what you see.