St. Mary's School serves 82 students in grades 7-9, is a member of the Other school association(s).
The student:teacher of St. Mary's School is 12:1 and the school's religious affiliation is Catholic.
Quick Facts (2025-26)
- Top Ranked IL School
- Grades: 7-9
- Enrollment: 82 students
- Yearly Tuition: $25,000
- Application Deadline: None / Rolling
- Source: National Center for Education Statistics (NCES)
Top Rankings
St. Mary's School ranks among the top 20% of private schools in Illinois for:
School Overview
School Membership(s)School Assoc.
Religious Affiliation
Grades Offered
Grades 7-9
Year Founded
1858
School Calendar
Last Day of School
Mon. May 25, 2026
Campus Size
5 acres
Student Body
Total Students
82 students
Student Body Type
Co-ed
% Students of Color
7%
State avg.: 34%
Students by Grade
Academics and Faculty
Total Classroom Teachers
7 teachers
Student-Teacher Ratio
12:1
National avg.: 13:1
Number of AP Courses
10 courses
Tuition and Acceptance Rate
Admission Deadline
None / Rolling
Yearly Tuition Cost
$25,000
Application URL
Endowment Size
$50 million
School Notes
- School Motto: Truth and Honor
Source: National Center for Education Statistics (NCES)
Frequently Asked Questions
How much does St. Mary's School cost?
St. Mary's School's tuition is approximately $25,000 for private students.
What is St. Mary's School's ranking?
St. Mary's School ranks among the top 20% of private schools in Illinois for: Oldest founding date and Largest endowments.
When is the application deadline for St. Mary's School?
The application deadline for St. Mary's School is rolling (applications are reviewed as they are received year-round).
School Reviews
Endorse St. Mary's 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
Recent Articles
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
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
Explore the A to Z of private schools in 2025—from admissions to tuition—offering parents and educators clear insights into today’s options.
