Private School Review - Established 2003
New England Innovation Academy
Hillside School

Marlborough Private High Schools (2026-27)

For the 2026-27 school year, there are 3 private high schools serving 296 students in Marlborough, MA.
The average acceptance rate is 60%, which is lower than the Massachusetts private high school average acceptance rate of 63%.

Quick Facts (2026-27)

Quick Facts (2026-27)

Top Ranked Marlborough Private High Schools (2026-27)

New England Innovation Academy Photo
New England Innovation Academy
Gr: 6-12 | 116 students
Avg. class size: 12 students
Sports: 8 | Extracurriculars: 17
Specialized Curriculum
280 Locke Drive
Marlborough, MA 01752
(508) 205-4270
View Profile
Hillside School Photo
Hillside School
Gr: K-9 | 145 students
Avg. class size: 12 students
Sports: 16 | Extracurriculars: 8
All-boys
404 Robin Hill Street
Marlborough, MA 01752
(508) 485-3483
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Map of Glenhaven Academy
Glenhaven Academy
Gr: 6-12 | 35 students
Special Education School
56 Framingham Rd 58
Marlborough, MA 01752
(508) 745-9462
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[+] Show Closed Private Schools in Marlborough, Massachusetts

Marlborough, Massachusetts Private Schools (Closed)

Map of Guidepost Montessori at Marlborough
Guidepost Montessori at Marlborough
Gr: NS-K
Montessori School
19 Forest St
Marlborough, MA 01752
(866) 202-8593
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Map of Immaculate Conception School
Immaculate Conception School
Gr: PK-8 | 156 students
Catholic
25 Washington Ct
Marlborough, MA 01752
(508) 460-3400
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Map of St. Anne Montessori School
St. Anne Montessori School
Gr: PK-K | 36 students
Avg. class size: 36 students
Montessori School (Catholic)
720 Boston Post Road East
Marlborough, MA 01752
(508) 597-1416
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Marlborough, MA Private School Trends (10-Year)

3
Private Schools
+50.0% (+1 school) 10-yr
296
Students
+77.2% (+129 students) 10-yr
$46,500
Avg. Tuition
-29.3% (-$19,300) 3-yr
12
Avg. Class Size
19%
Students of Color
-58.7% (-27.0 pp) 10-yr
7:1
Student-Teacher Ratio
+16.7% (+1.0) 10-yr
Download town snapshot: CSV | XML | JSON Data may not be displayed on any public-facing website or service that replicates or resembles a school search or review portal without prior written permission.
Enrollment & Diversity
Category
This Town (Marlborough)
This State (MA)
# Schools
3 Schools
261 Schools
# Students
296 Students
56,963 Students

Trends in the Average Number of Students Per Private High School

YearMarlborough, MA AvgMassachusetts (MA)National
202599225253
202498223245
2023102237247
2022101240257
202188234249
202084227235
201993231242
201889229238
201788233246
201684235241
201584213220
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% Students of Color
19%
28%

Percentage of Students of Color Trends (2015-2025)

YearMarlborough, MA AvgMassachusetts (MA)National
202519%27%32%
202427%24%31%
202333%27%31%
202233%28%30%
202131%27%30%
202024%24%29%
201927%23%29%
201826%22%28%
201720%25%30%
201620%25%30%
201546%28%30%
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0.62
0.52

Diversity Score Trends

YearMarlborough, MA AvgMassachusetts (MA)National
20250.620.520.61
20240.610.520.60
20230.650.510.60
20220.610.500.58
20210.610.490.57
20200.610.480.57
20190.640.450.56
20180.630.450.55
20170.620.460.54
20160.610.460.54
20150.610.450.53
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Show more data/charts: racial breakdown
# American Indian Students
n/a
127 Students
% American Indian Students
n/a
n/a
# Asian Students
13 Students
4,063 Students
% Asian Students
7%
7%

Asian Student Percentage Trends

YearMarlborough, MA AvgMassachusetts (MA)National
20257%7%5%
20247%8%6%
20237%8%6%
20227%7%5%
20217%8%5%
20207%8%5%
20197%7%5%
20188%7%5%
20178%5%4%
20168%5%4%
20158%6%4%
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# Hispanic Students
8 Students
3,645 Students
% Hispanic Students
4%
6%

Hispanic Student Percentage Trends

YearMarlborough, MA AvgMassachusetts (MA)National
20254%6%9%
20245%6%9%
20235%6%8%
20223%5%8%
20213%5%8%
20203%5%8%
20194%5%8%
20185%5%8%
20173%5%7%
20164%5%8%
20154%5%8%
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# Black Students
16 Students
3,816 Students
% Black Students
9%
7%

Black Student Percentage Trends

YearMarlborough, MA AvgMassachusetts (MA)National
20259%7%8%
20249%7%8%
20238%7%8%
20227%6%8%
20217%6%8%
20207%6%8%
20198%6%8%
20188%6%8%
201710%7%8%
201611%7%8%
201511%8%9%
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# White Students
102 Students
39,391 Students
% White Students
57%
67%

White Student Percentage Trends

YearMarlborough, MA AvgMassachusetts (MA)National
202557%67%59%
202458%67%60%
202352%68%60%
202257%70%62%
202157%70%63%
202057%71%64%
201953%73%64%
201855%73%65%
201756%73%66%
201658%73%66%
201559%73%66%
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# Hawaiian Students
1 Student
35 Students
% Hawaiian Students
1%
n/a
# Two or more races Students
n/a
n/a
% of Two or more races Students
n/a
n/a
# Others Students
40 Students
7,365 Students
% of Others Students
22%
13%

Other Races Student Percentage Trends

YearMarlborough, MA AvgMassachusetts (MA)National
202522%13%17%
202420%12%15%
202327%11%16%
202225%12%16%
202125%11%15%
202025%10%14%
201928%9%14%
201824%9%13%
201723%9%14%
201619%9%13%
201518%7%12%
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All Ethnic Groups
Academics
# Teachers
5 Teachers
8,579 Teachers
Average Student-Teacher Ratio
7:1
6:1

Student-Teacher Ratio Trends (2015-2025)

YearMarlborough, MA AvgMassachusetts (MA)National
20257:16:110:1
20245:17:110:1
20237:17:110:1
20227:17:110:1
20216:17:110:1
20205:17:110:1
20196:17:110:1
20186:17:110:1
20176:17:110:1
20166:17:110:1
20156:17:110:1
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% Average Faculty w/Advanced Degree
57%
71%

Percentage of Faculty With Advanced Degrees Trends (2015-2025)

YearMarlborough, MA AvgMassachusetts (MA)National
202557%70%57%
202466%71%57%
202357%70%57%
202264%70%56%
202164%69%56%
202057%69%56%
201933%67%55%
201833%66%55%
201733%65%55%
201633%63%54%
201525%63%54%
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Average Class Size
12 students
12 students

Class Size Trends (2015-2025)

YearMarlborough, MA AvgMassachusetts (MA)National
2025121214
2024111214
2023121214
2022131214
2021141214
2020131214
2019121214
2018121214
2017121214
2016121214
2015121214
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Tuition & Aid
Average Yearly Tuition Cost
$46,500
$40,847

Tuition Cost Trends (2022-2025)

YearMarlborough, MA AvgMassachusetts (MA)National
2025$60,250$40,860$17,997
2024$56,328$40,275$17,011
2023$56,328$36,992$16,191
2022$65,800$36,355$15,821
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Average % on Financial Aid
40%
40%

Percent on Financial Aid Trends (2015-2025)

YearMarlborough, MA AvgMassachusetts (MA)National
202541%39%38%
202441%40%37%
202341%40%36%
202241%38%36%
202141%37%36%
202041%37%35%
201932%35%34%
201832%35%33%
201731%34%32%
201631%32%31%
201536%33%30%
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Average Financial Aid Grant
$25,000
$28,887

Financial Aid Grant Trends (2020-2025)

YearMarlborough, MA AvgMassachusetts (MA)National
2025$25,000$27,597$9,714
2024$25,000$26,276$9,498
2023$25,000$25,898$8,890
2022$25,000$24,748$8,717
2021$25,000$24,315$8,472
2020$25,000$23,298$8,370
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Average Endowment Size
$5 million
$120.28 million

Endowment Trends (2020-2025)

YearMarlborough, MA AvgMassachusetts (MA)National
2025$5 M$110 M$43 M
2024$5 M$132 M$52 M
2023$5 M$129 M$51 M
2022$5 M$125 M$52 M
2021$5 M$127 M$52 M
2020$5 M$121 M$51 M
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Admissions & Athletics
Average Acceptance Rate
60%
63%

Acceptance Rate Trends (2023-2025)

YearMarlborough, MA AvgMassachusetts (MA)National
202550%62%79%
202450%54%81%
202350%55%81%
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Average Number of Extracurriculars
13 extracurriculars
20 extracurriculars
Average Number of Sports
12 sports
12 sports

Frequently Asked Questions

What are the top ranked private high schools in Marlborough, MA?
The top ranked private high schools in Marlborough, MA is Hillside School.
How many private high schools are located in Marlborough?
3 private high schools are located in Marlborough.

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