Enrollment
2,923
Illinois · 2024-25 NCES data
High school (grades 9-12) · Glenview, IL
Glenbrook South High School
Federal NCES profile for Glenbrook South High School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 53/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 172901003043
👥 S:T ratio 47
📚 AP courses 100
🌟 Gifted program 30
🎓 Counselors 51
📋 Attendance 35
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Glenbrook South High School earns 53/100 on the Resource Investment Index, with class sizes near the Illinois median. It is also one of the largest schools in Illinois.
- #13 of 13
- public schools in Glenview · Resource Index
- 53
- Resource Index · Higher
- 13.2:1
- students per teacher
- 2,923
- students enrolled
Glenbrook South High School has class sizes near the Illinois median. Computed live against every Illinois school reporting to NCES.
By Resource Investment Index, Glenbrook South High School ranks #13 of 13 public schools in Glenview, IL.
School address
District: Glenbrook Hsd 225 · Illinois
NCES ID 172901003043 Verify on NCES CCD record →
Teachers (FTE)
222.0
Federal CCD staff survey
Students per teacher
13.2:1
vs 14:1 Illinois avg
-6% vs state
Student-teacher ratio in context
How Glenbrook South High School compares with Illinois and U.S. medians
What stands out at Glenbrook South High School
Glenbrook South High School is a large high school in Glenview, Illinois, enrolling 2,923 students.
At 13.2:1, its student-teacher ratio sits close to the Illinois median, within a few percentage points of the 14:1 state norm, neither notably crowded nor notably small.
By headcount it is one of the larger campuses in Illinois, bigger than 99% of state schools at 2,923 students.
Its Resource Investment Index sits near the middle of the pack among 3,845 scored Illinois schools.
Its student body is led by White (54%) and Asian (23%), more mixed than most schools in the state (diversity index 63/100).
On the academic-pipeline side it reports 27 Advanced Placement courses.
Counselor coverage is strong, about 244 students per counselor, inside the American School Counselor Association's recommended 250:1.
Chronic absenteeism is elevated: 26.1% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
The surrounding Glenbrook Hsd 225 spends $29,799 per pupil, 75% above the Illinois average, a better-resourced district than most.
The federal civil-rights collection also records 3 expulsions at this campus for 2021-22.
Its district, Glenbrook Hsd 225, also runs Glenbrook North High School (2,111 students).
Sourced from NCES CCD, CRDC, and F-33 (federal records, not a quality verdict). How we source and compute this.
Source: National Center for Education Statistics Common Core of Data + CRDC + F-33 · 2024-25
How Glenbrook South High School compares
Glenbrook South High School on the metrics families compare, against Illinois and U.S. means.
| Metric | This school | vs Illinois | Illinois avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 13.2:1 | ▼ 6% | 14:1 | 15.7:1 |
| Enrollment | 2,923 | top 1% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
13.2:1
Leaner classes than 65% of US schools, a middle-of-the-pack class size.
2,923
Bigger than 99% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Staffing depth
13.2:1
students per teacher
- 6% below state mean
Top 45% in Illinois - lower ratio than 55% of state schools
Close to the 15:1 benchmark most often cited for individualized attention.
Engagement
26.1%
chronically absent (missed 10%+ of school days)
At or above 20%, the commonly used threshold for "high" chronic absenteeism, signaling significant barriers to regular attendance.
Funding equity
$29,799
per pupil, district-wide
- above Illinois avg of $17,042
Well above the U.S. public-school average, reflecting substantially higher local or state investment per enrolled student.
Support staff
Counselors12.0 FTE
Per 244 students, the combined health-and-guidance staffing load for this school.
Discipline context
94
in-school suspensions + 53 out-of-school
Suspension rate: 3.2 per 100 students. Combined in-school and out-of-school rate: 5.0 per 100 students. Reported via the Civil Rights Data Collection. Includes 3 expulsions.
Overview
- Common Core of Data (June 2026): enrollment, staffing, and the student-teacher ratio above.
- Civil Rights Data Collection: discipline counts and program access (AP, gifted, special education).
- F-33 School District Finance Survey: the district-wide per-pupil spending figures below.
Three separate federal collections, each on its own reporting cadence - which is why this school's numbers line up on a consistent basis against every other school and state on this site, rather than mixing figures pulled from different survey years.
Student demographics
White 54.0%
Asian 23.1%
Hispanic or Latino 15.9%
Two or More 5.0%
African American 1.8%
Native Hawaiian / Pacific Islander 0.2%
American Indian / Alaska Native 0.1%
Largest group: White at 54.0% of enrollment.
Student-body diversity index 62.7/100
Simpson diversity index - at 62.7, Glenbrook South High School is more mixed than the Illinois school average of 38.9.
Programs
AP courses offered 27
Funding & spending
District-wide per-pupil expenditure for Glenbrook Hsd 225, which includes Glenbrook South High School.
$29,799
Per student
+75%
vs Illinois
Avg $17,042
+80%
vs U.S.
Avg $16,593
Revenue mix
Local 78.4%
State 18.6%
Federal 3.0%
Source: NCES F-33 School District Finance Survey District-level finance · FY 2021-22 Per-pupil expenditure reflects the district-wide average. Individual school budgets are not reported at the federal level.
How Glenbrook South High School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Glenbrook North High School | Smaller | No free-lunch data | Similar S:T ratio |
Comparisons are relative to Glenbrook South High School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 2,111
- Students per teacher
- 14.1:1
- Resource Index
- 46/100
Similar high schools statewide
Matched by enrollment size and by staffing ratio across all of Illinois, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~2,923 students)
Similar student-teacher ratio (~13.2:1)
Next steps
Verify locally before acting on Glenbrook South High School's federal record.
- Compare Glenbrook South High School against another school. Compare schools
- Glenbrook Hsd 225's spending and staffing shape this school. District profile
- Confirm current enrollment and boundaries with the school. Choosing guide
Federal record (CCD 2024-25, CRDC 2021-22) - PlainSchools assigns no subjective rating; the composite quality score is a transparent, reproducible index computed from this cited federal data.
Frequently asked questions about Glenbrook South High School
How many students attend Glenbrook South High School?
Glenbrook South High School has 2,923 students enrolled. It is a high school in Glenview, IL.
What is the student-teacher ratio at Glenbrook South High School?
The student-teacher ratio at Glenbrook South High School is 13.2:1, which is 6% lower than the Illinois average of 14:1 and 16% lower than the national average of 15.7:1. Lower ratios generally mean more individual attention per student.
What is the racial and ethnic makeup of Glenbrook South High School?
The largest demographic group at Glenbrook South High School is White at 54.0% of enrollment, in Glenview, IL. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 62.7/100.
What is the Resource Investment Index for Glenbrook South High School?
Glenbrook South High School has a Resource Investment Index of 53/100 (higher reported resources relative to schools nationally) based on 5 factors: student-teacher ratio, AP course offerings, counselor availability, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Glenbrook South High School rank among public schools in Glenview?
By Resource Investment Index, Glenbrook South High School ranks #13 of 13 public schools in Glenview, IL. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all public schools in Glenview on the city page.
Is Glenbrook South High School a good school?
Glenbrook South High School earns 53/100 on the Resource Investment Index, with class sizes near the Illinois median. It is also one of the largest schools in Illinois. This is a resource snapshot, not an academic rating; see the Resource Investment Index question above for what the number does and doesn't measure.
What other schools are in Glenbrook Hsd 225?
Besides Glenbrook South High School, Glenbrook Hsd 225 also operates Glenbrook North High School (2,111 students). See the Glenbrook Hsd 225 district page for the complete list.
Related tools
Every figure on PlainSchools is rendered directly from the source NCES, CRDC and F-33 federal records, no number is typed in by an editor. Each school's figures reflect its most recent NCES/CRDC submission on file. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of June 2026.