Private School Review - Established 2003
St. Joseph School
Westmont Montessori School

Mendham Private Schools (2026-27)

For the 2026-27 school year, there are 3 private schools serving 313 students in Mendham, NJ, 17% of all K-12 students in Mendham, NJ are educated in private schools versus public schools (compared to the NJ state average of 14%).
The average acceptance rate is 90%, which is higher than the New Jersey private school average acceptance rate of 78%.
33% of private schools in Mendham, NJ are religiously affiliated (most commonly Catholic).

Quick Facts (2026-27)

Quick Facts (2026-27)

Private Schools in Mendham, NJ (2026-27)

Map of The Cottage School
The Cottage School
Gr: NS-8 | 20 students
Extracurriculars: 3
Alternative School
9E Main Street
Mendham, NJ 07945
(908) 719-9610
(1)
View Profile
St. Joseph School Photo
St. Joseph School
Gr: NS-8 | 156 students
Catholic
8 W Main St
Mendham, NJ 07945
(973) 543-7474
(2)
View Profile
Westmont Montessori School Photo
Westmont Montessori School
Gr: PK-K | 137 students
Avg. class size: 16 students
Extracurriculars: 1
Daycare / Preschool
577 State Route 24
Mendham, NJ 07945
(908) 879-6355
(2)
View Profile
[+] Show Closed Private Schools in Mendham, New Jersey

Mendham, New Jersey Private Schools (Closed)

Map of Daytop Preparatory School
Daytop Preparatory School
Gr: 9-12 | 66 students
Special Education School
80 W Main St
Mendham, NJ 07945
(973) 543-5656
View Profile

Mendham, NJ Private School Trends (10-Year)

3
Private Schools
+50.0% (+1 school) 10-yr
313
Students
+22.7% (+58 students) 10-yr
16
Avg. Class Size
-5.9% (-1 student) 9-yr
11%
Students of Color
+83.3% (+5.0 pp) 10-yr
9:1
Student-Teacher Ratio
-10.0% (-1.0) 10-yr
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Enrollment & Diversity
Category
This Town (Mendham)
This State (NJ)
# Schools
3 Schools
1,374 Schools
# Students
313 Students
216,366 Students

Trends in the Average Number of Students Per Private School

YearMendham, NJ AvgNew Jersey (NJ)National
2025104168179
2024104165172
202395164174
202299167185
202199165180
202099160171
2019129164175
2018129164172
2017127167180
2016119166178
2015128154167
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% Students of Color
11%
40%

Percentage of Students of Color Trends (2015-2025)

YearMendham, NJ AvgNew Jersey (NJ)National
202511%40%34%
202411%39%34%
202313%40%33%
202219%38%33%
202119%39%32%
202019%39%32%
201914%38%31%
201814%37%31%
20176%38%32%
20166%38%32%
20156%37%32%
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0.52
0.63

Diversity Score Trends

YearMendham, NJ AvgNew Jersey (NJ)National
20250.520.630.65
20240.520.640.65
20230.580.650.65
20220.580.650.64
20210.580.650.64
20200.580.650.64
20190.540.650.63
20180.540.650.63
20170.480.640.61
20160.450.650.61
20150.220.650.61
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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
2 Students
11,318 Students
% Asian Students
1%
5%

Asian Student Percentage Trends

YearMendham, NJ AvgNew Jersey (NJ)National
20251%6%5%
20241%6%5%
20231%6%5%
20221%6%4%
20211%5%4%
20201%5%4%
20192%5%4%
20182%5%4%
20172%5%4%
20162%5%4%
20153%4%4%
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# Hispanic Students
2 Students
15,574 Students
% Hispanic Students
1%
7%

Hispanic Student Percentage Trends

YearMendham, NJ AvgNew Jersey (NJ)National
20251%8%9%
20241%7%9%
20234%7%9%
20224%7%8%
20214%8%9%
20204%8%9%
20194%8%8%
20184%8%8%
20171%8%8%
20161%8%8%
20151%8%8%
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# Black Students
1 Student
14,112 Students
% Black Students
n/a
7%

Black Student Percentage Trends

YearMendham, NJ AvgNew Jersey (NJ)National
20233%7%8%
20223%8%7%
20213%8%7%
20203%8%8%
20193%9%7%
20183%9%7%
20171%9%7%
20161%9%7%
20151%9%8%
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# White Students
146 Students
116,208 Students
% White Students
50%
54%

White Student Percentage Trends

YearMendham, NJ AvgNew Jersey (NJ)National
202550%53%52%
202450%53%52%
202348%51%52%
202248%52%54%
202148%52%54%
202048%52%54%
201961%52%56%
201861%52%56%
201766%53%58%
201670%53%58%
201588%51%58%
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# Hawaiian Students
n/a
292 Students
% Hawaiian Students
n/a
n/a
# Two or more races Students
n/a
n/a
% of Two or more races Students
n/a
n/a
# Others Students
142 Students
58,685 Students
% of Others Students
48%
27%

Other Races Student Percentage Trends

YearMendham, NJ AvgNew Jersey (NJ)National
202548%27%26%
202448%27%26%
202344%29%25%
202244%27%25%
202144%27%25%
202044%27%24%
201930%26%24%
201830%26%23%
201730%25%22%
201626%25%22%
20157%28%21%
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All Ethnic Groups
Academics
# Teachers
36 Teachers
20,263 Teachers
Average Student-Teacher Ratio
9:1
11:1

Student-Teacher Ratio Trends (2015-2025)

YearMendham, NJ AvgNew Jersey (NJ)National
20259:111:111:1
20249:111:111:1
20238:111:111:1
202210:111:111:1
202110:111:111:1
202010:111:112:1
201910:111:112:1
201810:111:112:1
201710:111:112:1
201610:111:112:1
201510:112:112:1
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% Average Faculty w/Advanced Degree
40%
53%

Percentage of Faculty With Advanced Degrees Trends (2017-2025)

YearMendham, NJ AvgNew Jersey (NJ)National
202540%54%55%
202440%53%54%
202340%54%54%
202240%54%54%
202140%53%54%
202040%52%54%
201940%53%53%
201840%53%53%
201740%52%53%
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Average Class Size
16 students
14 students

Class Size Trends (2016-2025)

YearMendham, NJ AvgNew Jersey (NJ)National
2025161415
2024161415
2023161415
2022201415
2021201415
2020201415
2019201415
2018201415
2017201415
2016171415
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Tuition & Aid
Admissions & Athletics
Average Acceptance Rate
90%
78%
Average Number of Extracurriculars
2 extracurriculars
12 extracurriculars

Frequently Asked Questions

How many private schools are located in Mendham, NJ?
3 private schools are located in Mendham, NJ.
What percentage of students in Mendham go to private school?
17% of all K-12 students in Mendham are educated in private schools (compared to the NJ state average of 14%).
What percentage of private schools are religiously affiliated in Mendham?
33% of private schools in Mendham are religiously affiliated (most commonly Catholic).

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