Thornridge High School is a public four-year high school located in Dolton, Illinois, a suburb about 20 miles south of Chicago. The school is part of Thornton Township High School District 205. Thornridge High School first opened to the public in 1960 after completing construction of the current building.
Serving 969 students in grades 9-12, Thornridge High School ranks in the bottom 50% of all schools in Illinois for overall test scores (math proficiency is bottom 50%, and reading proficiency is bottom 50%).
The percentage of students achieving proficiency in math is 2% (which is lower than the Illinois state average of 27%). The percentage of students achieving proficiency in reading/language arts is 6% (which is lower than the Illinois state average of 30%).
The student-teacher ratio of 15:1 is higher than the Illinois state level of 13:1.
Minority enrollment is 99% of the student body (majority Black), which is higher than the Illinois state average of 55% (majority Hispanic and Black).
Quick Facts (2026)
- Grades: 9-12
- Enrollment: 969 students
- Student-Teacher Ratio: 15:1
- Minority Enrollment: 99%
- Graduation Rate: 80% (Btm 50% in IL)
- Overall Testing Rank: Bottom 50%
- Math Proficiency: 2% (Btm 50%)
- Reading Proficiency: 6% (Btm 50%)
- Science Proficiency: 12% (Btm 50%)
- Source: National Center for Education Statistics (NCES), IL Dept. of Education
School Overview
Thornridge High School's student population of 969 students has declined by 13% over five school years.
The teacher population of 63 teachers has declined by 35% over five school years.
Grades Offered
Grades 9-12
Total Students
969 students
Total Classroom Teachers
63 teachers
Year Founded
1960
Colors
Navy Blue, Grey, Columbia blue
School Calendar
Average Class Size
22 students
School Rankings
Thornridge High School ranks within the bottom 50% of all 3,542 schools in Illinois (based off of combined math and reading proficiency testing data).
The diversity score of Thornridge High School is 0.20, which is less than the diversity score at state average of 0.69. The school's diversity has stayed relatively flat over five school years.
Overall Testing Rank
#3483 out of 3542 schools
(Bottom 50%)
(Bottom 50%)
Math Test Scores (% Proficient)
2%
27%
Reading/Language Arts Test Scores (% Proficient)
6%
30%
Science Test Scores (% Proficient)
12%
50%
Student-Teacher Ratio
15:1
13:1
American Indian
n/a
n/a
Asian
n/a
6%
Hispanic
8%
29%
Black
89%
16%
White
1%
45%
Hawaiian
n/a
n/a
Two or more races
2%
4%
All Ethnic Groups
Graduation Rate
80%
87%
Eligible for Free Lunch
8%
43%
Eligible for Reduced Lunch (18-19)
20%
2%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), IL Dept. of Education
School Notes
- School Mascot: Wing Ding The Mighty Falcon
Frequently Asked Questions
What is Thornridge High School's ranking?
Thornridge High School is ranked #3483 out of 3,542 schools, which ranks it among the bottom 50% of public schools in Illinois.
What schools are Thornridge High School often compared to?
Thornridge High Schoolis often viewed alongside schools like Thornton Fractnl So High School, Phillips Academy High School, Thornwood High School by visitors of our site.
What percent of students have achieved state testing proficiency in math and reading?
2% of students have achieved math proficiency (compared to the 27% IL state average), while 6% of students have achieved reading proficiency (compared to the 30% IL state average).
What is the graduation rate of Thornridge High School?
The graduation rate of Thornridge High School is 80%, which is lower than the Illinois state average of 87%.
How many students attend Thornridge High School?
969 students attend Thornridge High School.
What is the racial composition of the student body?
89% of Thornridge High School students are Black, 8% of students are Hispanic, 2% of students are Two or more races, and 1% of students are White.
What is the student-teacher ratio of Thornridge High School?
Thornridge High School has a student ration of 15:1, which is higher than the Illinois state average of 13:1.
What grades does Thornridge High School offer ?
Thornridge High School offers enrollment in grades 9-12
What school district is Thornridge High School part of?
Thornridge High School is part of Thornton TWP HSD 205 School District.
School Reviews
Review Thornridge High School. Reviews should be a few sentences in length. Please include any comments on:
- Quality of academic programs, teachers, and facilities
- Availability of music, art, sports and other extracurricular activities
Recent Articles
AI Report Cards: Should Schools Evaluate AI Use?
Explore whether schools should assess student AI use, the benefits, risks, and what responsible AI report cards could look like in 2026.
The Parent’s Guide to School Cell Phone Bans in 2026
Learn how school cell phone bans work in 2026, why districts are adopting them, and what parents should expect.
Parental Involvement in Public Schools: 2026 Update
Explore the latest 2026 trends, research, and strategies shaping parental involvement in public schools and student success.
