Private School Review - Established 2003
American Boys Preparatory Academy
Kohler Academy

Mountainside Private Schools

For the 2026-27 school year, there are 3 private schools serving 238 students in Mountainside, NJ, 24% of all K-12 students in Mountainside, NJ are educated in private schools versus public schools (compared to the NJ state average of 14%).
The average acceptance rate is 75%, which is lower than the New Jersey private school average acceptance rate of 82%.

Quick Facts (26-27)

Quick Facts (26-27)

Private Schools in Mountainside, NJ (2026-27)

American Boys Preparatory Academy Photo
American Boys Preparatory Academy
Gr: 5-8 | 12 students
Avg. class size: 5 students
Sports: 1 | Extracurriculars: 7
All-boys | Alternative School
1020 Springfield Ave
Mountainside, NJ 07092
(908) 516-4231
(1)
View Profile
Kohler Academy Photo
Kohler Academy
Gr: PK-12 | 35 students
Special Education School
1137 Globe Ave
Mountainside, NJ 07092
(908) 518-0021
View Profile
Map of Primrose School At Mountainside
Primrose School At Mountainside
Gr: PK-K | 191 students
Daycare / Preschool
1038 Springfield Ave
Mountainside, NJ 70922
(908) 228-5589
View Profile

Mountainside, NJ Private School Trends (10-Year)

3
Private Schools
+50.0% (+1 school) 10-yr
238
Students
+150.5% (+143 students) 10-yr
$5,400
Avg. Tuition
-40.0% (-$3,600) 6-yr
5
Avg. Class Size
-16.7% (-1 student) 9-yr
25%
Students of Color
-35.9% (-14.0 pp) 10-yr
24:1
Student-Teacher Ratio
+242.9% (+17.0) 10-yr
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Enrollment & Diversity
Category
This Town (Mountainside)
This State (NJ)
# Schools
3 Schools
1,374 Schools
# Students
238 Students
216,299 Students

Trends in the Average Number of Students Per Private School

YearMountainside, NJ AvgNew Jersey (NJ)National
202579168179
202479165172
202380164174
202224167185
202123165180
202036160171
201926164175
201866164172
201770167180
201670166178
201548154167
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% Students of Color
25%
40%

Percentage of Students of Color Trends (2015-2025)

YearMountainside, NJ AvgNew Jersey (NJ)National
202525%40%34%
202425%39%34%
202323%40%33%
202244%38%33%
202144%39%32%
202044%39%32%
201965%38%31%
201833%37%31%
201730%38%32%
201630%38%32%
201539%37%32%
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0.35
0.63

Diversity Score Trends

YearMountainside, NJ AvgNew Jersey (NJ)National
20250.350.630.65
20240.350.640.65
20230.400.650.65
20220.600.650.64
20210.600.650.64
20200.600.650.64
20190.770.650.63
20180.700.650.63
20170.650.640.61
20160.650.650.61
20150.660.650.61
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Show more data/charts: racial breakdown
# American Indian Students
n/a
942 Students
% American Indian Students
n/a
n/a
# Asian Students
1 Student
11,318 Students
% Asian Students
n/a
5%

Asian Student Percentage Trends

YearMountainside, NJ AvgNew Jersey (NJ)National
20192%5%4%
20181%5%4%
20171%5%4%
20161%5%4%
20152%4%4%
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# Hispanic Students
5 Students
15,574 Students
% Hispanic Students
2%
7%

Hispanic Student Percentage Trends

YearMountainside, NJ AvgNew Jersey (NJ)National
20252%8%9%
20242%7%9%
20235%7%9%
202221%7%8%
202121%8%9%
202021%8%9%
201921%8%8%
20189%8%8%
20179%8%8%
20169%8%8%
201513%8%8%
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# Black Students
4 Students
14,112 Students
% Black Students
2%
7%

Black Student Percentage Trends

YearMountainside, NJ AvgNew Jersey (NJ)National
20252%6%7%
20242%7%7%
20234%7%8%
202221%8%7%
202121%8%7%
202021%8%8%
201929%9%7%
201813%9%7%
20178%9%7%
20168%9%7%
201512%9%8%
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# White Students
25 Students
116,208 Students
% White Students
11%
54%

White Student Percentage Trends

YearMountainside, NJ AvgNew Jersey (NJ)National
202511%53%52%
202411%53%52%
202315%51%52%
202256%52%54%
202156%52%54%
202056%52%54%
201931%52%56%
201837%52%56%
201735%53%58%
201635%53%58%
201552%51%58%
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# Hawaiian Students
11 Students
292 Students
% Hawaiian Students
5%
n/a
# Two or more races Students
n/a
n/a
% of Two or more races Students
n/a
n/a
# Others Students
180 Students
58,624 Students
% of Others Students
80%
27%

Other Races Student Percentage Trends

YearMountainside, NJ AvgNew Jersey (NJ)National
202580%27%26%
202480%27%26%
202376%29%25%
201912%26%24%
201838%26%23%
201747%25%22%
201647%25%22%
201521%28%21%
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All Ethnic Groups
Academics
# Teachers
10 Teachers
20,271 Teachers
Average Student-Teacher Ratio
24:1
11:1

Student-Teacher Ratio Trends (2015-2025)

YearMountainside, NJ AvgNew Jersey (NJ)National
202524:111:111:1
202424:111:111:1
202324:111:111:1
20226:111:111:1
20216:111:111:1
20206:111:112:1
20197:111:112:1
20186:111:112:1
20176:111:112:1
20166:111:112:1
20157:112:112:1
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% Average Faculty w/Advanced Degree
50%
53%

Percentage of Faculty With Advanced Degrees Trends (2016-2025)

YearMountainside, NJ AvgNew Jersey (NJ)National
202550%54%55%
202450%53%54%
202350%54%54%
202250%54%54%
202150%53%54%
201950%53%53%
201830%53%53%
201730%52%53%
201630%50%52%
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Average Class Size
5 students
14 students

Class Size Trends (2016-2025)

YearMountainside, NJ AvgNew Jersey (NJ)National
202551415
202451415
202351415
202251415
2021101415
2019101415
201881415
201781415
201661415
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Tuition & Aid
Average Yearly Tuition Cost
$5,400
$16,953

Tuition Cost Trends (2019-2025)

YearMountainside, NJ AvgNew Jersey (NJ)National
2025$5,400$18,947$15,012
2024$5,400$15,878$13,254
2023$5,400$15,215$12,626
2022$5,400$14,919$12,187
2021$5,400$13,993$11,800
2019$9,000$13,406$11,293
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Admissions & Athletics
Average Acceptance Rate
75%
82%

Acceptance Rate Trends (2019-2025)

YearMountainside, NJ AvgNew Jersey (NJ)National
202575%77%81%
202475%78%85%
202375%80%85%
202275%79%85%
202175%79%85%
201980%79%85%
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Average Number of Extracurriculars
7 extracurriculars
12 extracurriculars
Average Number of Sports
1 sports
7 sports

Frequently Asked Questions

How many private schools are located in Mountainside, NJ?
3 private schools are located in Mountainside, NJ.
What percentage of students in Mountainside go to private school?
24% of all K-12 students in Mountainside are educated in private schools (compared to the NJ state average of 14%).

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