Trinity High School, founded in 1918 by the Dominican Sisters of Sinsinawa Wisconsin, is a Catholic college-preparatory high school for young women.
Trinity has earned an excellent reputation as a premier high school with a strong commitment to educating young women and preparing them for the future: intellectually, spiritually, socially, and morally.
The school community guides young women in developing skills for lifelong learning, an ethnic of care and the desire for excellence.
Each student is recognized as unique. In a nurturing, catholic, college preparatory enviornment, she is encouraged to become self-directed toward responsible participation in the Christian community in order to impact society, Church and family in the twentyfirst century.
Quick Facts (2026)
- Top-Ranked IL School
- Grades: 9-12
- Enrollment: 422 students
- Yearly Tuition: $17,100
- Average class size: 15 students
- Application Deadline: None / Rolling
- Source: Verified school update
Top Rankings
Trinity High School ranks among the top 20% of private schools in Illinois for:
School Overview
Religious Affiliation
Grades Offered
Grades 9-12
Year Founded
1918
Colors
White, Navy Blue
Campus Size
small
Student Body
Total Students
422 students
Student Body Type
% Students of Color
46%
State avg.: 34%
Students by Grade
Academics and Faculty
Total Classroom Teachers
39 teachers
Student-Teacher Ratio
11:1
National avg.:
Average Class Size
15 students
Number of AP/Advanced Courses
34 courses
Tuition and Acceptance Rate
Admission Deadline
None / Rolling
Yearly Tuition Cost
$17,100
Application URL
School Notes
- School Mascot: Captain Blazer
- Trinity High School, founded in 1918 by the Dominican Sisters of Sinsinawa Wisconsin, is a Catholic college-preparatory high school for young women. Trinity has earned an excellent reputation as a premier high school with a strong commitment to educating young women and preparing them for the future: intellectually, spiritually, socially, and morally. The school community guides young women in developing skills for lifelong learning, an ethnic of care and the desire for excellence. Each student is recognized as unique. In a nurturing, catholic, college preparatory enviornment, she is encouraged to become self-directed toward responsible participation in the Christian community in order to impact society, Church and family in the twentyfirst century.
Source: Verified school update
Frequently Asked Questions
How much does Trinity High School cost?
Trinity High School's tuition is approximately $17,100 for private students.
What is Trinity High School's ranking?
Trinity High School ranks among the top 20% of private schools in Illinois for: Largest student body and Most AP courses offered.
When is the application deadline for Trinity High School?
The application deadline for Trinity High School is rolling (applications are reviewed as they are received year-round).
School Calendar
View the Trinity High School below. Note key dates such as:
Event
Date
School Closed in Observance of Juneteenth
June 19, 2026 (Friday)
School Closed
June 26, 2026 (Friday)
School Closed in Observance of Independence Day
July 02, 2026 (Thursday)
School Closed
July 03, 2026 (Friday)
School Closed
July 10, 2026 (Friday)
Related Schools
Show me:
People that viewed Trinity High School also viewed these schools: Fenwick High School, Walther Christian Academy, St. Ignatius College Prep, Providence St. Mel School and Nazareth Academy.
The nearest high school to Trinity High School is Walther Christian Academy (1.7 miles away)
The nearest elementary school and preschool is Grace Lutheran School (0.3 miles away)
Show me:
Show me:
School
Location
Miles
Quick Facts
Fenwick High School
(Catholic)
505 Washington Blvd
Oak Park, IL 60302
(708) 948-0332
Oak Park, IL 60302
(708) 948-0332
2 miles
Gr: 9-12 | 1,101 students Sports: 18
Walther Christian Academy ![Walther Christian Academy Photo - Science class in the Science & Technology Wing]( "Walther Christian Academy Photo - Science class in the Science & Technology Wing")
(Lutheran Church Missouri Synod)
900 Chicago Avenue
Melrose Park, IL 60160
(708) 344-0404
Melrose Park, IL 60160
(708) 344-0404
1.7 miles
Gr: 6-12 | 242 students Avg. class size: 80 students Sports: 13 Tuition & acceptance rate listed
1076 West Roosevelt Road
Chicago, IL 60608
(312) 421-5900
Chicago, IL 60608
(312) 421-5900
8.6 miles
Gr: 9-12 | 1,373 students Avg. class size: 15 students Tuition & acceptance rate listed
119 S Central Park Blvd
Chicago, IL 60624
(773) 265-2204
Chicago, IL 60624
(773) 265-2204
5.3 miles
Gr: PK-12 | 317 students Avg. class size: 15 students Tuition & acceptance rate listed
Nazareth Academy
(Catholic)
1209 West Ogden Avenue
La Grange Park, IL 60526
(708) 354-0061
La Grange Park, IL 60526
(708) 354-0061
6.7 miles
Gr: 9-12 | 720 students Avg. class size: 24 students Sports: 16 | Extracurrculars: 30 Tuition listed
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