St. Mary's School in Alton, IL, serves 82 co鈥揺d udents in grades 7 through 9 within a suburban community setting.
Founded in 1858, the Catholic鈥揳ffiliated school employs 7 teachers for a udent鈥搕eacher ratio of 12:1.
The school offers 10 Advanced Placement (AP) courses and charges an annual tuition of $25,000.
Mary's enrollment reflects 7.3% udent diversity and the campus occupies 5 acres.
Among private schools in Illinois,. Mary's ranks in the top 20% for school hiory and resources based on founding date and endowment size.
Quick Facts (2026)
- 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.:
Number of AP/Advanced 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).
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