Trinity High School (Top Ranked Private School for 2026-27)

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Quick Facts (26-27)

Top Ranked IL School
Grades: 9-12
Enrollment: 422 students
Application Deadline: None / Rolling
Source: ✓Verified school update

School Rankings

Trinity High School ranks among the top 20% of private schools in Illinois for:

School Facts

Religious Affiliation

Catholic

Grades Offered

Grades 9-12

Students By Grade

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Distribution of Students By Grade

Grade	Trinity High School
9	86
10	112
11	117
12	107

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Grade 11 largest at 117 students, with Grade 10 at 112, Grade 12 at 107, and Grade 9 at 86.

Year Founded

1918

School Calendar

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Student Body

Total Students

422 students

Student Body Type

All-girls

% Students of Color

46%

State avg.: 34%

Academic Profile

Total Classroom Teachers

39 teachers

Student-Teacher Ratio

10:1

National avg.: 11:1

School Membership(s)School Assoc.

International Baccalaureate World School (IB)

Tuition & Financial Aid

Admission Deadline

None / Rolling

Yearly Tuition Cost

14,500

View national tuition avg.

College Acceptance Rate

100%

Application URL

Online Application

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Sports

Colors

White, Navy Blue

School Mascot

Captain Blazer

School Notes

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.

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

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Frequently Asked Questions

What is Trinity High School's ranking?

Trinity High School ranks among the top 20% of private schools in Illinois for: Largest student body, Most AP courses offered and Oldest founding date.

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).

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Did You Know?

The average private school tuition in Cook County, IL is $12,325 for elementary schools and $18,699 for high schools (read more about average private school tuition across the country).

The average acceptance rate in Cook County, IL is 87% (read more about average acceptance rates across the country).