Hillside School Photo - Hillside School is located on 150 acres of land that is 45 minutes from Boston and 20 minutes from Worcester.

Best Marlborough Private High Schools (2026)

For the 2026 school year, there are 3 private high schools serving 296 students in Marlborough, MA.
The top-ranked private high school in Marlborough, MA is Hillside School.
The average acceptance rate is 50%, which is lower than the Massachusetts private high school average acceptance rate of 62%.

Top-Ranked Marlborough Private High Schools (2026)

School
Location
Quick Facts
New England Innovation Academy
New England Innovation Academy Photo
Special Program Emphasis
280 Locke Drive
Marlborough, MA 01752
(508) 205-4270
Gr: 6-12 | 116 students Avg. class size: 12 students Sports: 8 | Extracurrculars: 17 Tuition & acceptance rate listed
Hillside School
Hillside School Photo - Soccer and lacrosse play on our new turf.
All-boys
404 Robin Hill Street
Marlborough, MA 01752
(508) 485-3483
Gr: 4-9 | 145 students Avg. class size: 12 students Sports: 14 | Extracurrculars: 8 Tuition listed
Glenhaven Academy
Special Education School
56 Framingham Rd 58
Marlborough, MA 01752
(508) 745-9462
Gr: 6-12 | 35 students
[+] Show Closed Private Schools in Marlborough, Massachusetts

Marlborough, Massachusetts Private Schools (Closed)

School
Location
Quick Facts
19 Forest St
Marlborough, MA 01752
(866) 202-8593
Gr: NS-K
25 Washington Ct
Marlborough, MA 01752
(508) 460-3400
Gr: PK-8 | 156 students
St. Anne Montessori School (Closed 2013)
Montessori School (Catholic)
720 Boston Post Road East
Marlborough, MA 01752
(508) 597-1416
Gr: PK-K | 36 students Avg. class size: 36 students Tuition listed

Overview

This Town (Marlborough)
This State (MA)
# Schools
3 Schools

Student Body:

# Students
296 Students
57,195 Students
% Average Students of Color
19%
27%

Academics and Faculty:

# Teachers
5 Teachers
8,486 Teachers
Average Student-Teacher Ratio
7:1
6:1
% Average Faculty w/Advanced Degree
57%
70%
Average Class Size
12 students
12 students

Tuition and Acceptance Rate:

Average Yearly Tuition Cost
$60,250
$40,829
Average % on Financial Aid
41%
39%
Average Financial Aid Grant
$25,000
$27,641
Average Acceptance Rate
50%
62%
Average Endowment Size
$5 million
$112.36 million

Students by Ethnicity:

0.62
0.52
# 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%
# Hispanic Students
8 Students
3,645 Students
% Hispanic Students
4%
6%
# Black Students
16 Students
3,816 Students
% Black Students
9%
7%
# White Students
102 Students
39,391 Students
% White Students
57%
67%
# 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
7,401 Students
% of Others Students
22%
13%
All Ethnic Groups

Extracurriculars and Sports:

Average Number of Extracurriculars
13 extracurriculars
20 extracurriculars
Average Number of Sports
11 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.

Recent Articles

Financial Aid 101 for Private School Families 2026
Financial Aid 101 for Private School Families 2026
Guide to private school financial aid in 2026, with current costs, key planning timelines and practical steps parents need to maximize aid options.
Why Extracurricular Activities Matter in 2026
Why Extracurricular Activities Matter in 2026
Discover why extracurricular activities remain essential in 2026, with updated research, costs, and admissions insights for parents and students.
How to Appeal for Financial Aid After Admission
How to Appeal for Financial Aid After Admission
Learn how to appeal for financial aid after admission to a private school, with expert steps, timelines, and 2026 updates for families.