Enrollment
2,591
Illinois · 2024-25 NCES data
High school (grades 9-12) · Downers Grove, IL
Comm H S Dist 99 - South High Sch
Federal NCES profile for Comm H S Dist 99 - South High Sch, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 42/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 171257001519
👥 S:T ratio 42
📚 AP courses 55
🌟 Gifted program 30
🎓 Counselors 53
📋 Attendance 29
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Comm H S Dist 99 - South High Sch earns 42/100 on the Resource Investment Index, with class sizes near the Illinois median. It is also one of the largest schools in Illinois.
- #17 of 17
- public schools in Downers Grove · Resource Index
- 42
- Resource Index · Typical
- 14.5:1
- students per teacher
- 2,591
- students enrolled
Comm H S Dist 99 - South High Sch has class sizes near the Illinois median. Computed live against every Illinois school reporting to NCES.
By Resource Investment Index, Comm H S Dist 99 - South High Sch ranks #17 of 17 public schools in Downers Grove, IL.
School address
NCES ID 171257001519 Verify on NCES CCD record →
Teachers (FTE)
179.0
Federal CCD staff survey
Students per teacher
14.5:1
vs 14:1 Illinois avg
+4% vs state
Student-teacher ratio in context
How Comm H S Dist 99 - South High Sch compares with Illinois and U.S. medians
What stands out at Comm H S Dist 99 - South High Sch
Comm H S Dist 99 - South High Sch is a large high school in Downers Grove, Illinois, enrolling 2,591 students.
Class loads run somewhat heavier than typical: 14.5:1 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 99% of state schools at 2,591 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 Hispanic or Latino (23%), more mixed than most schools in the state (diversity index 64/100).
On the academic-pipeline side it reports 11 Advanced Placement courses.
Counselor coverage is strong, about 236 students per counselor, inside the American School Counselor Association's recommended 250:1.
Chronic absenteeism is elevated: 28.4% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
The surrounding Chsd 99 spends $24,940 per pupil, 46% above the Illinois average, a better-resourced district than most.
Among Downers Grove's high schools, it stands alongside Comm H S Dist 99 - North H S (2,082 students): Comm H S Dist 99 - South High Sch is larger than that campus by headcount and runs heavier classes (14.5:1 vs 13.6:1).
Its district, Chsd 99, also runs Comm H S Dist 99 - North H S (2,082 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 Comm H S Dist 99 - South High Sch compares
Comm H S Dist 99 - South High Sch on the metrics families compare, against Illinois and U.S. means.
| Metric | This school | vs Illinois | Illinois avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 14.5:1 | ▲ 4% | 14:1 | 15.7:1 |
| Enrollment | 2,591 | top 1% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
14.5:1
Leaner classes than 52% of US schools, a middle-of-the-pack class size.
2,591
Bigger than 99% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Staffing depth
14.5:1
students per teacher
- 4% above state mean
Top 63% in Illinois - lower ratio than 37% of state schools
Close to the 15:1 benchmark most often cited for individualized attention.
Engagement
28.4%
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
$24,940
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
Counselors11.0 FTE
Per 236 students, the combined health-and-guidance staffing load for this school.
Discipline context
2
in-school suspensions + 99 out-of-school
Suspension rate: 0.1 per 100 students. Combined in-school and out-of-school rate: 3.9 per 100 students. Reported via the Civil Rights Data Collection.
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 54.1%
Hispanic or Latino 22.9%
African American 11.2%
Asian 7.2%
Two or More 4.2%
Native Hawaiian / Pacific Islander 0.3%
American Indian / Alaska Native 0.1%
Largest group: White at 54.1% of enrollment.
Student-body diversity index 63.5/100
Simpson diversity index - at 63.5, Comm H S Dist 99 - South High Sch is more mixed than the Illinois school average of 38.9.
Programs
AP courses offered 11
Funding & spending
District-wide per-pupil expenditure for Chsd 99, which includes Comm H S Dist 99 - South High Sch.
$24,940
Per student
+46%
vs Illinois
Avg $17,042
+50%
vs U.S.
Avg $16,593
Revenue mix
Local 73.9%
State 23.0%
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 Comm H S Dist 99 - South High Sch Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Comm H S Dist 99 - North H S | Similar size | No free-lunch data | Similar S:T ratio |
Comparisons are relative to Comm H S Dist 99 - South High Sch's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 2,082
- Students per teacher
- 13.6:1
- Resource Index
- 45/100
Similar high schools in Downers Grove
1 comparable high schools (grades 9-12) serving the same city.
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 (~2,591 students)
Next steps
Verify locally before acting on Comm H S Dist 99 - South High Sch's federal record.
- Compare Comm H S Dist 99 - South High Sch against another school. Compare schools
- Chsd 99'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 Comm H S Dist 99 - South High Sch
How many students attend Comm H S Dist 99 - South High Sch?
Comm H S Dist 99 - South High Sch has 2,591 students enrolled. It is a high school in Downers Grove, IL.
What is the student-teacher ratio at Comm H S Dist 99 - South High Sch?
The student-teacher ratio at Comm H S Dist 99 - South High Sch is 14.5:1, which is 4% higher than the Illinois average of 14:1 and 8% lower than the national average of 15.7:1.
What is the racial and ethnic makeup of Comm H S Dist 99 - South High Sch?
The largest demographic group at Comm H S Dist 99 - South High Sch is White at 54.1% of enrollment, in Downers Grove, IL. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 63.5/100.
What is the Resource Investment Index for Comm H S Dist 99 - South High Sch?
Comm H S Dist 99 - South High Sch has a Resource Investment Index of 42/100 (typical 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 Comm H S Dist 99 - South High Sch rank among public schools in Downers Grove?
By Resource Investment Index, Comm H S Dist 99 - South High Sch ranks #17 of 17 public schools in Downers Grove, 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 Downers Grove on the city page.
Is Comm H S Dist 99 - South High Sch a good school?
Comm H S Dist 99 - South High Sch earns 42/100 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 Chsd 99?
Besides Comm H S Dist 99 - South High Sch, Chsd 99 also operates Comm H S Dist 99 - North H S (2,082 students). See the Chsd 99 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.