St. Mary's High School
Parish school · Grades 9–12
Manhasset, NY
51 Clapham Ave, Manhasset, NY 11030
Overall grade: A+
ChooseAPrivateSchool.com grade, from official facts compared with similar schools.
- A-Class size
- ACollege-going
- BYears serving families
- A+Diversity
What stands out
- The largest Catholic school in Manhasset
- 98% of graduates go to four-year colleges
St. Mary's High School is a Catholic parish school in Manhasset, New York, for students from 9th grade through 12th grade. It has about 329 students and around 13 students per teacher. The school is part of the Diocese of Rockville Centre. The school reports that about 98% of its graduates go on to four-year colleges. Students attend about 6.5 hours a day, 180 days a year.
At a glance
- Grades
- Grades 9–12
- Students
- 329
- Teachers
- 26.3 (full-time equivalent)
- Students per teacher
- 12.5
- Boys and girls
- Coed · 174 girls, 155 boys
- Religious affiliation
- Catholic · Parish school
- Diocese
- Diocese of Rockville Centre
- School day
- About 6.5 hours
- School year
- 180 days
- Graduates going to 4-year colleges
- About 98% (the school's estimate for the class before the survey)
Reviews
Be the first to share what you love about St. Mary's High School.
How it compares
- Smaller classes than 55% of Catholic high schools in New York (13 students per teacher).
- A smaller school: fewer students than 58% of Catholic high schools in New York.
- Compared with 64 Catholic high schools in New York.
Students by grade
Student body
Member of
- National Catholic Educational Association
Questions to ask on a tour
- What is tuition, and what does it include (books, fees, uniforms, trips)?
- Do you offer financial aid, sibling discounts or payment plans?
- Do you accept ESA, voucher or tax-credit scholarship funds?
- How big are classes in my child's grade?
- What support is there for students who need extra help or more challenge?
- Is the school accredited, and by whom?
- What do a typical day and a typical week look like?
- How does the school communicate with families?
Questions about St. Mary's High School
What grades does St. Mary's High School serve?
St. Mary's High School serves grades 9–12.
How many students attend St. Mary's High School?
About 329 students, with 13 students per teacher, according to official records.
How much is tuition at St. Mary's High School?
Call the school to ask about tuition, financial aid and payment plans.
Official record · Updated October 2026 · Official search · Something wrong? Tell us
Other private schools nearby
St. Marys High School
Parish school · Grades 9–12
The largest Catholic school in Manhasset
Manhasset, NY0.0 mi
Magen Israel-Gan Israel Center
Jewish day school · Grades Pre-K–7
Smaller classes than 60% of Jewish day schools in New York
Great Neck, NY0.8 mi
Mesivta of Great Neck
Jewish day school · Grades 9–11
Smaller classes than 92% of Jewish day schools in New York
Great Neck, NY0.8 mi
Our Lady of Grace Montessori School
Independent Catholic school · Grades Pre-K–3
The smallest classes of any Catholic school in Manhasset
Manhasset, NY1.1 mi
Vincent Smith School
Special education school · Grades 2–12
Smaller classes than 82% of special education schools in New York
Port Washington, NY1.9 mi
Long Island Hebrew Academy
Jewish day school · Grades Pre-K–7
Serving families in Great Neck since at least 2011
Great Neck, NY1.9 mi