St. Mary School

16 Harrison Ave East Islip, NY 11730
saintmaryschoolei.org

Quick Facts (26-27)

  • Top Ranked NY School
  • Grades: Prekindergarten-8
  • Enrollment: 501 students
  • Application Deadline: None / Rolling
  • Source: National Center for Education Statistics (NCES)

About the School

  • St. Mary School was established in 1914 by the School Sisters of Notre Dame.
  • Now in our ninetieth year, we continue to provide challenging academic programs rooted in the Catholic tradition for children in Nursery (3 year olds) through Grade 8.
  • The dedication and strong commitment of the administration, faculty, staff, clergy, and parents to continued growth and quality Catholic education permeates the strong family – centered school community.
  • Centered in the Word of God and the gift of Jesus in our midst, the mission of St. Mary School is to educate the whole child.
  • The school's role in leading students toward a life of Gospel values is to work in partnership with parents to foster academic, spiritual, and moral development.

Quick Facts (26-27)

  • Top Ranked NY School
  • Grades: Prekindergarten-8
  • Enrollment: 501 students
  • Application Deadline: None / Rolling
  • Source: National Center for Education Statistics (NCES)

School Rankings

St. Mary School ranks among the top 20% of private schools in New York for:

Category
Attribute
Student Body
School History

School Facts

Religious Affiliation
Grades Offered
Grades Prekindergarten-8
Students By Grade
Year Founded
1914
School Calendar

Student Body

Total Students
501 students
Student Body Type
Co-ed
% Students of Color
32%
State avg.: 39%

Academic Profile

Total Classroom Teachers
27 teachers
Student-Teacher Ratio
19:1
National avg.: 11:1
School Membership(s)School Assoc.

Tuition & Financial Aid

Admission Deadline
None / Rolling

Request Information

Step 1 of 2
Step 2 of 2

School Notes

  • St. Mary School was established in 1914 by the School Sisters of Notre Dame. Now in our ninetieth year, we continue to provide challenging academic programs rooted in the Catholic tradition for children in Nursery (3 year olds) through Grade 8. The dedication and strong commitment of the administration, faculty, staff, clergy, and parents to continued growth and quality Catholic education permeates the strong family – centered school community. Centered in the Word of God and the gift of Jesus in our midst, the mission of St. Mary School is to educate the whole child. The school's role in leading students toward a life of Gospel values is to work in partnership with parents to foster academic, spiritual, and moral development.
  • Sample of notable school alumni/alumnae:
    • Brendan and Tyler - Class of 2023 -
    • James and Emma - Class of 2023 -
Source: National Center for Education Statistics (NCES)

Frequently Asked Questions

Who are famous alumni from St. Mary School?
St. Mary School famous alumni include: Brendan and Tyler - Class of 2023 and James and Emma - Class of 2023.
What is St. Mary School's ranking?
St. Mary School ranks among the top 20% of private schools in New York for: Largest student body and Oldest founding date.
When is the application deadline for St. Mary School?
The application deadline for St. Mary School is rolling (applications are reviewed as they are received year-round).

School Reviews

Endorse St. Mary School. Endorsements should be a few sentences in length. Please include any comments on:

  • Quality of academic programs, teachers, and facilities
  • Availability of music, art, sports and other extracurricular activities
  • Academic or athletic awards
Endorse this school

Recent Articles

Should Your Child Stay at the Same Private School K–12?
Should Your Child Stay at the Same Private School K–12?
Explore whether your child should attend the same private school from kindergarten through graduation, weighing academic continuity, friendships, changing needs, tuition costs, and opportunities at different educational stages.
When Your Child's Closest Friends Leave Private School
When Your Child's Closest Friends Leave Private School
Learn how to support your child when close friends leave private school, manage loneliness, maintain friendships, encourage new connections, recognize emotional challenges, and decide when additional school support is needed.
When Your Child Doesn't Connect With Their Teacher
When Your Child Doesn't Connect With Their Teacher
Discover when parents should intervene if their child struggles to connect with a private school teacher, including warning signs, communication strategies, classroom concerns, and practical steps toward improving relationships.
School location map

Request Info

Ask St. Mary School for admission information. Two short steps.

REQUEST INFO

Did You Know?

The average private school tuition in Suffolk County, NY is $20,759 for elementary schools and $27,758 for high schools (read more about average private school tuition across the country).
The average acceptance rate in Suffolk County, NY is 80% (read more about average acceptance rates across the country).

Quick Links