Quick Facts (2026-27)
- 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
St. Mary School
About the School
- 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 (2026-27)
- 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
School Rankings
St. Mary School ranks among the top 20% of private schools in Illinois for:
Category
Attribute
Student Body
School Facts
Student Body
Total Students
253 students
Student Body Type
Co-ed
% Students of Color
16%
State avg.: 34%
Academic Profile
Total Classroom Teachers
16 teachers
Student-Teacher Ratio
16:1
National avg.:
Average Class Size
22 students
Classroom Dress Code
Casual
Uniform skirts/jumpers/pants
Advanced Courses
Advanced Math for students in 5th-8th grade
School Membership(s)School Assoc.
Tuition & Financial Aid
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 for more information.
Admissions Director
Lorena Reyes
Application URL
Sports
Total Sports Offered
4 sports
School Mascot
Lancers
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
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).
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The nearest high school, elementary school and preschool to St. Mary School is Northwester Center For Autism (2.8 miles away)
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Gr: PK-5 | 127 students
Avg. class size: 15 students
Sports: 4 | Extracurriculars: 3
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(815) 895-8522
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355 N Cross St
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(815) 895-8522
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Dekalb, IL 60115
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Daycare / Preschool
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(815) 758-1541
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Avg. class size: 15 students
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Christian
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(815) 895-8522
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26555 Brickville Rd
Sycamore, IL 60178
(815) 895-0303
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(815) 787-4144
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Gr: PK-12 | 78 students
Avg. class size: 10 students
Sports: 3
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315 E North St
Somonauk, IL 60552
(815) 498-2313
Distance: 23.0 mi
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Avg. class size: 20 students
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(630) 553-5158
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(331) 207-8932
Distance: 26.2 mi
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2001 Whitekirk Ln
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(630) 708-7927
Distance: 2.8 mi
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Dekalb, IL 60115
(815) 787-4144
Distance: 7.3 mi
Gr: PK-8 | 104 students
Sports: 4 | Extracurriculars: 2
Catholic
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Sycamore, IL 60178
(815) 895-5215
Distance: 7.9 mi
Gr: PK-5 | 127 students
Avg. class size: 15 students
Sports: 4 | Extracurriculars: 3
Christian
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(815) 895-8522
Distance: 14.8 mi
Gr: K-8 | 9 students
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315 N 6th St
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(815) 787-4144
Distance: 3.5 mi
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Daycare / Preschool
207 E Hillcrest Dr.
Dekalb, IL 60115
(815) 758-1541
Distance: 7.3 mi
Gr: PK-8 | 104 students
Sports: 4 | Extracurriculars: 2
Catholic
222 Waterman St
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(815) 895-5215
Distance: 7.9 mi
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Avg. class size: 15 students
Sports: 4 | Extracurriculars: 3
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Sycamore, IL 60178
(815) 895-8522
Distance: 9.1 mi
Gr: K | 4 students
Montessori School
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Sycamore, IL 60178
(815) 895-0303
School
(Math and Reading Proficiency)
(Math and Reading Proficiency)
Location
Miles
Quick Facts
(Math: 30-39% | Reading: 40-49%)
Rank:
Rank:
8/
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100 1st St
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Rochelle, IL 61068
(815) 562-7191
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Alternative School
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1401 Flagg Rd
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(Math: 10-14% | Reading: 6-9%)
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1050 N 9th St
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(815) 562-8251
Rochelle, IL 61068
(815) 562-8251
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Gr: 2-3 | 330 students Student-Teacher Ratio: 14:1 Minority enrollment: 56%
(Math: 12% | Reading: 18%)
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Rochelle, IL 61068
(815) 562-6665
9154.5 miles
Gr: 4-5 | 288 students Student-Teacher Ratio: 14:1 Minority enrollment: 53%
School Reviews
5 11/10/2023
Fantastic and safe school with amazing teachers. Highly recommend!
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The average private school tuition in Illinois is $9,515 for elementary schools and $14,358 for high schools (read more about average private school tuition across the country).
The average acceptance rate in Illinois is 89% (read more about average acceptance rates across the country).
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