Quick Facts (2026-27)
- Top Ranked IL School
- Grades: 9-12
- Enrollment: 383 students
- Yearly Tuition: $6,310
- Average class size: 16 students
- Application Deadline: None / Rolling
- Source: ✓Verified school update
Mater Dei High School
About the School
- Mater Dei, a Catholic, diocesan, regional high school, nurtures the spiritual, moral, intellectual, emotional, and social growth of young men and women.
- In a caring environment, respectful of individual differences, her comprehensive program educates, fosters faith and develops gospel values.
Quick Facts (2026-27)
- Top Ranked IL School
- Grades: 9-12
- Enrollment: 383 students
- Yearly Tuition: $6,310
- Average class size: 16 students
- Application Deadline: None / Rolling
- Source: ✓Verified school update
School Rankings
Mater Dei High School ranks among the top 20% of private schools in Illinois for:
School Facts
Student Body
Total Students
383 students
Student Body Type
Co-ed
% Students of Color
5%
State avg.: 34%
Academic Profile
Total Classroom Teachers
30 teachers
Student-Teacher Ratio
13:1
National avg.:
% Faculty w/Advanced Degree
50%
Average Class Size
16 students
Average ACT score
24
(Out of 36)
Number of AP Courses
2 courses
School Membership(s)School Assoc.
Tuition & Financial Aid
Admission Deadline
None / Rolling
Yearly Tuition Cost
Application URL
Sports
Total Sports Offered
12 sports
Colors
White, Navy Blue, Columbia blue
School Notes
- Mater Dei, a Catholic, diocesan, regional high school, nurtures the spiritual, moral, intellectual, emotional, and social growth of young men and women. In a caring environment, respectful of individual differences, her comprehensive program educates, fosters faith and develops gospel values.
Source: Verified school update
Frequently Asked Questions
How much does Mater Dei High School cost?
Mater Dei High School's tuition is approximately $6,310 for private students.
What sports does Mater Dei High School offer?
Mater Dei High School offers 12 interscholastic sports: Baseball, Basketball, Bowling, Cheering, Cross Country, Football, Golf, Soccer, Softball, Swimming, Volleyball and Weightlifting. Mater Dei High School is ranked as one of the top 20% of private schools in Illinois for most sports offered.
What is Mater Dei High School's ranking?
Mater Dei High School ranks among the top 20% of private schools in Illinois for: Largest student body and Most sports offered.
When is the application deadline for Mater Dei High School?
The application deadline for Mater Dei High School is rolling (applications are reviewed as they are received year-round).
Nearby ÌÇÐÄÔ´´s
The nearest high school to Mater Dei High School is Christ Our Rock Lutheran High School (18.6 miles away)
The nearest elementary school and preschool is All Saints Academy (0.5 miles away)
Show me:
Distance: 0.5 mi
Gr: PK-8 | 357 students
Avg. class size: 17 students
Catholic
295 N Clinton St
Breese, IL 62230
(618) 526-4323
Distance: 11.4 mi
Gr: PK-8 | 230 students
Catholic
1416 Main St
Highland, IL 62249
(618) 654-7525
Distance: 13.2 mi
Gr: PK-8 | 90 students
Avg. class size: 8 students
Sports: 7
Lutheran Church Missouri Synod
606 S Hanover St
Okawville, IL 62271
(618) 243-6142
Distance: 15.5 mi
Gr: PK-8 | 64 students
Sports: 4 | Extracurriculars: 3
Lutheran Church Missouri Synod
8701 Huey Rd
Hoffman, IL 62250
(618) 495-2246
Distance: 16.3 mi
Gr: PK-8 | 172 students
Catholic
215 N John St
Mascoutah, IL 62258
(618) 566-2922
Distance: 18.6 mi
Gr: 9-12 | 108 students
Avg. class size: 15 students
Sports: 10
Lutheran Church Missouri Synod
9545 Shatuc Rd
Centralia, IL 62801
(618) 226-3315
Distance: 21.8 mi
Gr: K-12 | 281 students
Avg. class size: 20 students
Sports: 5
Baptist
1111 E Highway 50
O Fallon, IL 62269
(618) 726-6040
Distance: 23.0 mi
Gr: K-12 | 449 students
Baptist
7110 State Rt. 162
Maryville, IL 62062
(618) 505-7000
Distance: 23.1 mi
Gr: 9-12 | 263 students
Catholic
7190 Bouse Rd
Glen Carbon, IL 62034
(618) 401-4550
Distance: 24.3 mi
Gr: PK-12 | 35 students
Avg. class size: 10 students
Christian
5100 N Illinois St
Fairview Heights, IL 62208
(618) 825-0609
Distance: 0.5 mi
Gr: PK-8 | 357 students
Avg. class size: 17 students
Catholic
295 N Clinton St
Breese, IL 62230
(618) 526-4323
Distance: 11.4 mi
Gr: PK-8 | 230 students
Catholic
1416 Main St
Highland, IL 62249
(618) 654-7525
Distance: 13.2 mi
Gr: PK-8 | 90 students
Avg. class size: 8 students
Sports: 7
Lutheran Church Missouri Synod
606 S Hanover St
Okawville, IL 62271
(618) 243-6142
Distance: 15.5 mi
Gr: PK-8 | 64 students
Sports: 4 | Extracurriculars: 3
Lutheran Church Missouri Synod
8701 Huey Rd
Hoffman, IL 62250
(618) 495-2246
Distance: 16.3 mi
Gr: PK-8 | 172 students
Catholic
215 N John St
Mascoutah, IL 62258
(618) 566-2922
Distance: 0.5 mi
Gr: PK-8 | 357 students
Avg. class size: 17 students
Catholic
295 N Clinton St
Breese, IL 62230
(618) 526-4323
Distance: 11.4 mi
Gr: PK-8 | 230 students
Catholic
1416 Main St
Highland, IL 62249
(618) 654-7525
Distance: 13.2 mi
Gr: PK-8 | 90 students
Avg. class size: 8 students
Sports: 7
Lutheran Church Missouri Synod
606 S Hanover St
Okawville, IL 62271
(618) 243-6142
Distance: 15.5 mi
Gr: PK-8 | 64 students
Sports: 4 | Extracurriculars: 3
Lutheran Church Missouri Synod
8701 Huey Rd
Hoffman, IL 62250
(618) 495-2246
Distance: 16.3 mi
Gr: PK-8 | 172 students
Catholic
215 N John St
Mascoutah, IL 62258
(618) 566-2922
School
(Math and Reading Proficiency)
(Math and Reading Proficiency)
Location
Miles
Quick Facts
(Math: 41% | Reading: 45%)
Rank:
Rank:
9/
Top 20%10
707 N Smiley St
O Fallon, IL 62269
(618) 632-6391
O Fallon, IL 62269
(618) 632-6391
8890.6 miles
Gr: PK-5 | 465 students Student-Teacher Ratio: 16:1 Minority enrollment: 29%
(Math: 36% | Reading: 42%)
Rank:
Rank:
8/
Top 30%10
600 S Smiley St
O Fallon, IL 62269
(618) 632-3507
O Fallon, IL 62269
(618) 632-3507
8890.6 miles
Gr: 9-12 | 2,540 students Student-Teacher Ratio: 16:1 Minority enrollment: 41%
(Math: 33% | Reading: 46%)
Rank:
Rank:
8/
Top 30%10
1 Wildcat Xing
O Fallon, IL 62269
(618) 632-7434
O Fallon, IL 62269
(618) 632-7434
8890.6 miles
Gr: 4-8 | 331 students Student-Teacher Ratio: 17:1 Minority enrollment: 40%
(Math: 35-39% | Reading: 35-39%)
Rank:
Rank:
8/
Top 30%10
802 Dartmouth Dr
O Fallon, IL 62269
(618) 632-3335
O Fallon, IL 62269
(618) 632-3335
8890.8 miles
Gr: PK-5 | 421 students Student-Teacher Ratio: 20:1 Minority enrollment: 51%
(Math: 40-49% | Reading: 30-34%)
Rank:
Rank:
8/
Top 30%10
125 Diamond Ct
O Fallon, IL 62269
(618) 632-7434
O Fallon, IL 62269
(618) 632-7434
8890.8 miles
Gr: PK-3 | 245 students Student-Teacher Ratio: 13:1 Minority enrollment: 34%
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Did You Know?
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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