St. Mary School, East Islip NY: K-8, 331 Students

St. Mary School is a Roman Catholic private school in East Islip, NY teaching grades K-8. It reported 331 students and about 15.8 students for every teacher in the 2023-24 federal survey.

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School facts

Grades: K-8
Students: 331
Teachers: 21
Students per teacher: 15.8
Student body: Coeducational
Program: Regular
Affiliation: Roman Catholic
Setting: Suburb

Member of: National Catholic Educational Association

These are the numbers the school gave the U.S. Department of Education for the 2023-24 school year, published in July 2026. The survey counts students in kindergarten to grade 12, not pre-K. Enrollment and staffing move every year, so ask the school for today’s figures. Where this comes from. Something wrong? Tell us and we will fix it.

St. Mary School tuition

We have not verified a tuition figure for St. Mary School yet. Every private school sets its own price and most share it on request: ask for the full-year tuition for your child’s grade plus required fees, or look for a tuition page on the school’s website.

Questions to ask St. Mary School

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Other private schools nearby

School	Grades	Students	Per teacher	Affiliation	Miles
St. Patrick School	PreK-8	395	15	Roman Catholic	3
MDQ Academy	PreK-12	276	9.2	Islamic	4
Bay Shore Christian School	K-6	71	11.8	Assembly of God	4
Nysarc Inc-Suffolk Chapter	PreK	90	10	Nonsectarian	5
West Sayville Christian School	K-12	40	3.4	Christian (nondenominational)	5
St. John the Baptist Diocesan High School	9-12	969	15	Roman Catholic	6
Ascent School for Individuals With Autism	K-12	17	4.2	Nonsectarian	6
Developmental Disabilities Institute	PreK	6	6	Nonsectarian	7

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