Glenbrook South High School, or GBS, is a public four-year high school located in Glenview, Illinois, a north suburb of Chicago, in the United States. It is part of Northfield Township High School District, which also includes Glenbrook North High School.
Serving 3,015 students in grades 9-12, Glenbrook South High School ranks in the top 10% of all schools in Illinois for overall test scores (math proficiency is top 10%, and reading proficiency is top 10%).
The percentage of students achieving proficiency in math is 57% (which is higher than the Illinois state average of 27%). The percentage of students achieving proficiency in reading/language arts is 59% (which is higher than the Illinois state average of 30%).
The student:teacher ratio of 13:1 is equal to the Illinois state level of 13:1.
Minority enrollment is 45% of the student body (majority Asian), which is lower than the Illinois state average of 55% (majority Hispanic).
Quick Stats (2025)
- Grades: 9-12
- Enrollment: 3,015 students
- Student:Teacher Ratio: 13:1
- Minority Enrollment: 45%
- Graduation Rate: 96% (Top 5% in IL)
- Overall Testing Rank: Top 10%
- Math Proficiency: 57% (Top 10%)
- Reading Proficiency: 59% (Top 10%)
- Science Proficiency: 72% (Top 20%)
- Source: National Center for Education Statistics (NCES), IL Dept. of Education
Top Rankings
Glenbrook South High School ranks among the top 20% of public schools in Illinois for:
Category
Attribute
Overall Rank
Most improved public schools
Math Proficiency
Reading/Language Arts Proficiency
Science Proficiency
Graduation Rate
School Overview
Glenbrook South High School's student population of 3,015 students has stayed relatively flat over five school years.
The teacher population of 229 teachers has stayed relatively flat over five school years.
Grades Offered
Grades 9-12
Total Students
3,015 students
Gender %
Total Classroom Teachers
229 teachers
Year Founded
1962
Colors
Navy Blue, Gold
School Calendar
School Rankings
Glenbrook South High School ranks within the top 10% of all 3,542 schools in Illinois (based off of combined math and reading proficiency testing data).
The diversity score of Glenbrook South High School is 0.63, 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
#182 out of 3542 schools
(Top 10%)
(Top 10%)
Math Test Scores (% Proficient)
57%
27%
Reading/Language Arts Test Scores (% Proficient)
59%
30%
Science Test Scores (% Proficient)
72%
50%
Student : Teacher Ratio
13:1
13:1
American Indian
n/a
n/a
Asian
22%
6%
Hispanic
16%
28%
Black
2%
17%
White
55%
45%
Hawaiian
n/a
n/a
Two or more races
5%
4%
All Ethnic Groups
Graduation Rate
96%
87%
Eligible for Free Lunch
20%
43%
Eligible for Reduced Lunch (11-12)
15%
27%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), IL Dept. of Education
School Notes
- School Mascot: Tommy The Titan
Profile last updated: 02/09/2025
Frequently Asked Questions
What is Glenbrook South High School's ranking?
Glenbrook South High School is ranked #182 out of 3,542 schools, which ranks it among the top 10% of public schools in Illinois.
What schools are Glenbrook South High School often compared to?
Glenbrook South High Schoolis often viewed alongside schools like Glenbrook North High School by visitors of our site.
What percent of students have achieved state testing proficiency in math and reading?
57% of students have achieved math proficiency (compared to the 27% IL state average), while 59% of students have achieved reading proficiency (compared to the 30% IL state average).
What is the graduation rate of Glenbrook South High School?
The graduation rate of Glenbrook South High School is 96%, which is higher than the Illinois state average of 87%.
How many students attend Glenbrook South High School?
3,015 students attend Glenbrook South High School.
What is the racial composition of the student body?
55% of Glenbrook South High School students are White, 22% of students are Asian, 16% of students are Hispanic, 5% of students are Two or more races, and 2% of students are Black.
What is the student:teacher ratio of Glenbrook South High School?
Glenbrook South High School has a student ration of 13:1, which is equal to the Illinois state average of 13:1.
What grades does Glenbrook South High School offer ?
Glenbrook South High School offers enrollment in grades 9-12
What school district is Glenbrook South High School part of?
Glenbrook South High School is part of Glenbrook HSD 225 School District.
School Reviews
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