Welcome to St. Mary Catholic School DeKalb, IL Where Faith Meets Excellence in Education At St.
Mary Catholic School, we are dedicated to nurturing the whole child-spiritually, academically, and personally-within a vibrant, faith-filled community.
Serving students from preschool through 8th grade, our school offers a strong foundation rooted in Catholic values, academic excellence, and a commitment to service.
Our experienced and caring faculty deliver a rigorous curriculum that blends traditional instruction with innovative, hands-on learning opportunities.
We offer advanced programs in math, science, STEM, music, and Spanish, along with a wide range of extracurriculars and leadership opportunities.
With small class sizes, we are able to provide personalized attention that allows each student to grow in confidence, character, and capability.
Located in the heart of DeKalb, we are proud to partner with local institutions like Northern Illinois University to enrich our academic programs and offer real-world connections for our students.
Our close-knit school community fosters a welcoming and supportive environment where families feel at home.
Discover a school where students are known, loved, and challenged to become the best version of themselves-mind, body, and spirit.
We invite you to come see the difference at St. Mary Catholic School.
Quick Facts (2025-26)
- Top Ranked IL School
- Grades: Nursery/Preschool-8
- Enrollment: 253 students
- Yearly Tuition: $4,985
- Average class size: 22 students
- Application Deadline: None / Rolling
- Source: Verified school update
Top Rankings
St. Mary School ranks among the top 20% of private schools in Illinois for:
Category
Attribute
Student Body
School Overview
School Membership(s)School Assoc.
Religious Affiliation
Grades Offered
Grades Nursery/Preschool-8
ADD/ADHD Support
Yes
School Calendar
Last Day of School
Thu. May 21, 2026
Student Body
Total Students
253 students
Student Body Type
Co-ed
% Students of Color
16%
State avg.: 34%
Students by Grade
Academics and Faculty
Total Classroom Teachers
16 teachers
Student-Teacher Ratio
16:1
National avg.: 13:1
Average Class Size
22 students
Advanced Courses
Advanced Math for students in 5th-8th grade
Classroom Dress Code
Casual
Uniform skirts/jumpers/pants
Tuition and Acceptance Rate
Admission Deadline
None / Rolling
Yearly Tuition Cost
Tuition Notes
This is per child. There is also a registration fee of $250.00 for new families and technology fees by grade. Visit www.stmaryschooldekalb.org for more information.
Admissions Director
Lorena Reyes
Application URL
Sports
Total Sports Offered
4 sports
Extracurriculars
Total ExtracurricularsTotal Extra-curric.
4 extracurriculars
ExtracurricularsExtra-curric.
Club or Organization:
Arts and Music Programs:
Chess Club
Arts and Music Programs:
Band ProgramForensics Team
Spring Musical
School Notes
- School Motto: It's more than an education ... it's faith, values and family too!
- School Mascot: Lancers
Source: Verified school update
Frequently Asked Questions
How much does St. Mary School cost?
St. Mary School's tuition is approximately $4,985 for private students.
What schools are St. Mary School often compared to?
St. Mary School is often viewed alongside schools like St. Mary Catholic School by visitors of our site.
What sports does St. Mary School offer?
St. Mary School offers 4 interscholastic sports: Basketball, Soccer, Track and Field and Volleyball.
What is St. Mary School's ranking?
St. Mary School ranks among the top 20% of private schools in Illinois for: Largest student body.
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
5 11/10/2023
Fantastic and safe school with amazing teachers. Highly recommend!
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