- Enrollment
- 2,330
- Students per teacher
- 17.8:1
- Resource Index
- 34/100
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 39/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 171683001990
👥 S:T ratio 38
🌟 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 39/100 on the Resource Investment Index, with class sizes larger than 76% 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
- 39
- Resource Index · Typical
- 15.6:1
- large classes for Illinois
- 1,090
- students enrolled
Glenbard South High School has class sizes larger than 76% 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 →
NCES CCD universe card
School universe 171683001990 · Glen Ellyn, IL High · MID · TRAD
1,090 enr · 15.6:1 · RII 39
Nearest enrollment peer: Glenbard West High School (2,330 students)
Resource Investment Index #10 of 11 public schools in Glen Ellyn. NCES Common Core of Data stamps for this campus. Read with this school → · District book → · Illinois schools → · Find another →
Glenbard South High School in the enrollment neighbourhood
Fall enrollment among this campus and nearest district peers
- Glenbard West
Glenbard West High School
2,330 students
- Glenbard East
Glenbard East High School
2,311 students
- Glenbard North
Glenbard North High School
2,079 students
- This school
Glenbard South High School
1,090 students
What this shows Glenbard South High School reports 1,090 students on the CCD universe file.
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 | 15.6:1 | ▲ 11% | 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
15.6:1
Leaner classes than 41% 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
15.6:1
students per teacher
- 11% above state mean
Top 76% in Illinois - lower ratio than 24% 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
$24,208
per pupil, district-wide
- above Illinois avg of $18,196
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.
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
AP courses offered 20
Funding & spending
District-wide per-pupil expenditure for Glenbard Twp Hsd 87, which includes Glenbard South High School.
$24,208
Per student
+33%
vs Illinois
Avg $18,196
+37%
vs U.S.
Avg $17,658
Revenue mix
Local 71.1%
State 25.0%
Federal 3.8%
Source: NCES F-33 School District Finance Survey District-level finance · FY 2022-23 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
- 2,311
- Students per teacher
- 16.7:1
- Resource Index
- 30/100
- Enrollment
- 2,079
- Students per teacher
- 15:1
- Resource Index
- 35/100
Similar high schools in Glen Ellyn
1 comparable high schools (grades 9-12) serving the same city.
Nationwide high schools with similar size or staffing
Out-of-state peers matched by enrollment and by student-teacher ratio, not the same-city or same-district lists above.
Similar enrollment (~1,090 students)
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 15.6:1, which is 11% higher than the Illinois average of 14:1 and 1% 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 39/100 (typical reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, gifted-program reporting, counselor availability, chronic absenteeism. 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.
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.
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, the data changelog, or report a data error. Data current as of August 2026.