St. Marys High School
Parish school · Grades 9–12
Manhasset, NY
51 Clapham Ave, Manhasset, NY 11030
Overall grade: B+
ChooseAPrivateSchool.com grade, from official facts compared with similar schools.
- B+Class size
- B-Years serving families
- A+Diversity
What stands out
- The largest Catholic school in Manhasset
St. Marys 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. Students attend about 6.5 hours a day, 180 days a year.
At a glance
- Grades
- Grades 9–12
- Students
- 329
- Teachers
- 24.5 (full-time equivalent)
- Students per teacher
- 13.4
- Boys and girls
- Coed · 178 girls, 151 boys
- Religious affiliation
- Catholic · Parish school
- Diocese
- Diocese of Rockville Centre
- School day
- About 6.5 hours
- School year
- 180 days
Reviews
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How it compares
- 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. Marys High School
What grades does St. Marys High School serve?
St. Marys High School serves grades 9–12.
How many students attend St. Marys High School?
About 329 students, with 13 students per teacher, according to official records.
How much is tuition at St. Marys 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
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