Enrollment
1,090
Illinois · 2024-25 NCES data
High school (grades 9-12) · Glen Ellyn, IL
Glenbard South High School
Federal NCES profile for Glenbard South High School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 51/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 171683001990
👥 S:T ratio 38
📚 AP courses 100
🌟 Gifted program 30
🎓 Counselors 46
📋 Attendance 41
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Glenbard South High School earns 51/100 on the Resource Investment Index, with class sizes larger than 75% of Illinois schools. It is also more racially and ethnically mixed than most Illinois schools.
- #10 of 11
- public schools in Glen Ellyn · Resource Index
- 51
- Resource Index · Higher
- 15.4:1
- large classes for Illinois
- 1,090
- students enrolled
Glenbard South High School has class sizes larger than 75% of Illinois schools. Computed live against every Illinois school reporting to NCES.
By Resource Investment Index, Glenbard South High School ranks #10 of 11 public schools in Glen Ellyn, IL.
School address
District: Glenbard Twp Hsd 87 · Illinois
NCES ID 171683001990 Verify on NCES CCD record →
Teachers (FTE)
70.0
Federal CCD staff survey
Students per teacher
15.4:1
vs 14:1 Illinois avg
+10% vs state
Student-teacher ratio in context
How Glenbard South High School compares with Illinois and U.S. medians
What stands out at Glenbard South High School
Glenbard South High School is a large high school in Glen Ellyn, Illinois, enrolling 1,090 students.
Class loads run somewhat heavier than typical: 15.4:1 puts it in the larger third of Illinois schools by student-teacher ratio.
By headcount it is one of the larger campuses in Illinois, bigger than 94% of state schools at 1,090 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 (56%) and Hispanic or Latino (18%), more mixed than most schools in the state (diversity index 63/100).
On the academic-pipeline side it reports 20 Advanced Placement courses.
Counselor coverage runs a bit thin, about 273 students per counselor, somewhat past the ASCA-recommended 250:1 benchmark.
Attendance runs somewhat below the norm, with 23.5% of students chronically absent per the 2021-22 civil-rights collection.
The surrounding Glenbard Twp Hsd 87 spends $22,879 per pupil, 34% above the Illinois average, a better-resourced district than most.
Among Glen Ellyn's high schools, it stands alongside Glenbard West High School (2,330 students): Glenbard South High School is smaller than that campus by headcount and runs leaner classes (15.4:1 vs 17.7:1).
Glenbard Twp Hsd 87 also operates Glenbard West High School (2,330 students) and Glenbard East High School (2,311 students) alongside Glenbard South High School.
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 Glenbard South High School compares
Glenbard 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 | 15.4:1 | ▲ 10% | 14:1 | 15.7:1 |
| Enrollment | 1,090 | top 6% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
15.4:1
Leaner classes than 45% of US schools, a middle-of-the-pack class size.
1,090
Bigger than 93% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Staffing depth
15.4:1
students per teacher
- 10% above state mean
Top 75% in Illinois - lower ratio than 25% of state schools
Close to the 15:1 benchmark most often cited for individualized attention.
Engagement
23.5%
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
$22,879
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
Counselors4.0 FTE
Per 273 students, the combined health-and-guidance staffing load for this school.
Discipline context
0
in-school suspensions + 11 out-of-school
Suspension rate: 0.0 per 100 students. Combined in-school and out-of-school rate: 1.0 per 100 students. Reported via the Civil Rights Data Collection.
Overview
Enrollment 1,090 Top 6% in Illinois - larger than 94% of 3,845 state schools
Teachers (FTE) 70.0
Students per teacher 15.4:1 +10% vs state
Free-lunch eligible -
NCES ID 171683001990
Student demographics
White 55.5%
Hispanic or Latino 18.3%
Asian 12.2%
African American 9.7%
Two or More 3.9%
Native Hawaiian / Pacific Islander 0.4%
American Indian / Alaska Native 0.1%
Largest group: White at 55.5% of enrollment.
Student-body diversity index 63.3/100
Simpson diversity index - at 63.3, Glenbard South High School is more mixed than the Illinois school average of 38.9.
Programs & staff
AP courses offered 20
Counselors (FTE) 4.0
Students per counselor 273:1
Discipline & special education
Chronically absent 23.5%
In-school suspensions 0
Out-of-school suspensions 11
Funding & spending
District-wide per-pupil expenditure for Glenbard Twp Hsd 87, which includes Glenbard South High School.
$22,879
Per student
+34%
vs Illinois
Avg $17,042
+38%
vs U.S.
Avg $16,593
Revenue mix
Local 71.1%
State 25.0%
Federal 3.8%
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 Glenbard South High School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Glenbard West High School | Larger | No free-lunch data | Higher S:T ratio |
| Glenbard East High School | Larger | No free-lunch data | Similar S:T ratio |
| Glenbard North High School | Larger | No free-lunch data | Similar S:T ratio |
Comparisons are relative to Glenbard South High School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 2,330
- Students per teacher
- 17.7:1
- Resource Index
- 35/100
- Enrollment
- 2,311
- Students per teacher
- 16.5:1
- Resource Index
- 30/100
- Enrollment
- 2,079
- Students per teacher
- 15.6:1
- Resource Index
- 34/100
Similar high schools in Glen Ellyn
1 comparable high schools (grades 9-12) serving the same city.
Next steps
Verify locally before acting on Glenbard South High School's federal record.
- Compare Glenbard South High School against another school. Compare schools
- Glenbard Twp Hsd 87'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 Glenbard South High School
How many students attend Glenbard South High School?
Glenbard South High School has 1,090 students enrolled. It is a high school in Glen Ellyn, IL.
What is the student-teacher ratio at Glenbard South High School?
The student-teacher ratio at Glenbard South High School is 15.4:1, which is 10% higher than the Illinois average of 14:1 and 2% lower than the national average of 15.7:1.
What is the racial and ethnic makeup of Glenbard South High School?
The largest demographic group at Glenbard South High School is White at 55.5% of enrollment, in Glen Ellyn, IL. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 63.3/100.
What is the Resource Investment Index for Glenbard South High School?
Glenbard South High School has a Resource Investment Index of 51/100 (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 Glenbard South High School rank among public schools in Glen Ellyn?
By Resource Investment Index, Glenbard South High School ranks #10 of 11 public schools in Glen Ellyn, 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 Glen Ellyn on the city page.
Is Glenbard South High School a good school?
Glenbard South High School earns 51/100 on the Resource Investment Index, with class sizes larger than 75% of Illinois schools. It is also more racially and ethnically mixed than most Illinois schools. 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 Glenbard Twp Hsd 87?
Besides Glenbard South High School, Glenbard Twp Hsd 87 also operates Glenbard West High School (2,330 students), Glenbard East High School (2,311 students), and Glenbard North High School (2,079 students). See the Glenbard Twp Hsd 87 district page for the complete list.