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 (2025-26)

For the 2025-26 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 (2025-26)

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: 15 | Extracurrculars: 9 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
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

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

Transferring from Public to Private School Mid-Year: What to Expect
Transferring from Public to Private School Mid-Year: What to Expect
Considering a mid-year transfer from public to private school? Learn what to expect with admissions, academic placement, social adjustment, and financial aid to ensure a smooth transition.
A Guide to Day vs. Boarding School: Which Is Right for Your Family
A Guide to Day vs. Boarding School: Which Is Right for Your Family
Discover the key differences between day and boarding schools to determine the best fit for your child. Explore benefits, costs, lifestyle factors, and questions to help guide your family’s decision.
The A to Z of Private Schools 2025
The A to Z of Private Schools 2025
Explore the A to Z of private schools in 2025—from admissions to tuition—offering parents and educators clear insights into today’s options.