Enrollment
812
Illinois · 2024-25 NCES data
Middle school (grades 6-8) · Arlington Heights, IL
South Middle School
Federal NCES profile for South Middle School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 49/100.
2024-25 NCES dataMiddle school (grades 6-8)NCES 170414000105
👥 S:T ratio 49
🌟 Gifted program 30
📋 Attendance 67
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
South Middle School earns 49/100 on the Resource Investment Index, with class sizes near the Illinois median.
- #7 of 13
- public schools in Arlington Heights · Resource Index
- 49
- Resource Index · Higher
- 12.7:1
- students per teacher
- 812
- students enrolled
South Middle School has class sizes near the Illinois median. Computed live against every Illinois school reporting to NCES.
By Resource Investment Index, South Middle School ranks #7 of 13 public schools in Arlington Heights, IL.
School address
District: Arlington Heights Sd 25 · Illinois
NCES ID 170414000105 Verify on NCES CCD record →
Teachers (FTE)
67.0
Federal CCD staff survey
Students per teacher
12.7:1
vs 14:1 Illinois avg
-9% vs state
Student-teacher ratio in context
How South Middle School compares with Illinois and U.S. medians
What stands out at South Middle School
South Middle School is a large middle school in Arlington Heights, Illinois, enrolling 812 students.
Class sizes run a bit leaner than typical: 12.7:1 puts it in the smaller third of Illinois schools by student-teacher ratio.
By headcount it is one of the larger campuses in Illinois, bigger than 90% of state schools at 812 students.
Its Resource Investment Index lands in the upper third of 3,845 scored Illinois schools.
Its student body is predominantly White (84% of enrollment) (diversity index 29/100).
13.3% of students were chronically absent in the 2021-22 collection, in line with the post-pandemic national range.
Among Arlington Heights's middle schools, it stands alongside Thomas Middle School (1,024 students): South Middle School is smaller than that campus by headcount and runs leaner classes (12.7:1 vs 13.3:1).
Arlington Heights Sd 25 also operates Thomas Middle School (1,024 students) and Olive-Mary Stitt School (671 students) alongside South Middle 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 South Middle School compares
South Middle 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 | 12.7:1 | ▼ 9% | 14:1 | 15.7:1 |
| Enrollment | 812 | top 10% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
12.7:1
Leaner classes than 72% of US schools, among the more generously staffed nationally.
812
Bigger than 86% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Staffing depth
12.7:1
students per teacher
- 9% below state mean
Top 37% in Illinois - lower ratio than 63% of state schools
Well under the widely cited 15:1 individualized-attention benchmark, among the leaner class loads nationally.
Engagement
13.3%
chronically absent (missed 10%+ of school days)
In the 10-15% range, above the pre-pandemic national baseline but within the broader post-pandemic picture.
Funding equity
$17,811
per pupil, district-wide
- above Illinois avg of $17,042
Somewhat above the U.S. public-school average, reflecting higher local or state investment per enrolled student.
Support staff
Counselors0.0 FTE
Student-support staffing from the Civil Rights Data Collection.
Discipline context
17
in-school suspensions + 9 out-of-school
Suspension rate: 2.1 per 100 students. Combined in-school and out-of-school rate: 3.2 per 100 students. Reported via the Civil Rights Data Collection.
Overview
Enrollment 812 Top 10% in Illinois - larger than 90% of 3,845 state schools
Teachers (FTE) 67.0
Students per teacher 12.7:1 -9% vs state
Free-lunch eligible -
NCES ID 170414000105
Student demographics
White 83.6%
Hispanic or Latino 9.0%
Asian 6.2%
African American 1.0%
Native Hawaiian / Pacific Islander 0.1%
Two or More 0.1%
Largest group: White at 83.6% of enrollment.
Student-body diversity index 28.9/100
Simpson diversity index - at 28.9, South Middle School is less mixed than the Illinois school average of 38.9.
Programs & staff
Counselors (FTE) 0.0
Discipline & special education
Chronically absent 13.3%
In-school suspensions 17
Out-of-school suspensions 9
Funding & spending
District-wide per-pupil expenditure for Arlington Heights Sd 25, which includes South Middle School.
$17,811
Per student
+5%
vs Illinois
Avg $17,042
+7%
vs U.S.
Avg $16,593
Revenue mix
Local 69.9%
State 24.8%
Federal 5.3%
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 South Middle School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Thomas Middle School | Larger | No free-lunch data | Similar S:T ratio |
| Olive-Mary Stitt School | Similar size | No free-lunch data | Higher S:T ratio |
| Westgate Elem School | Similar size | No free-lunch data | Similar S:T ratio |
| Ivy Hill Elem School | Smaller | No free-lunch data | Higher S:T ratio |
| Dryden Elem School | Smaller | No free-lunch data | Higher S:T ratio |
Comparisons are relative to South Middle School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,024
- Students per teacher
- 13.3:1
- Resource Index
- 49/100
- Enrollment
- 671
- Students per teacher
- 16:1
- Resource Index
- 48/100
- Enrollment
- 633
- Students per teacher
- 12.5:1
- Resource Index
- 53/100
- Enrollment
- 593
- Students per teacher
- 16.1:1
- Resource Index
- 42/100
- Enrollment
- 521
- Students per teacher
- 15.6:1
- Resource Index
- 49/100
Similar middle schools in Arlington Heights
1 comparable middle schools (grades 6-8) serving the same city.
Next steps
Verify locally before acting on South Middle School's federal record.
- Compare South Middle School against another school. Compare schools
- Arlington Heights Sd 25'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 South Middle School
How many students attend South Middle School?
South Middle School has 812 students enrolled. It is a middle school in Arlington Heights, IL.
What is the student-teacher ratio at South Middle School?
The student-teacher ratio at South Middle School is 12.7:1, which is 9% lower than the Illinois average of 14:1 and 19% 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 South Middle School?
The largest demographic group at South Middle School is White at 83.6% of enrollment, in Arlington Heights, IL.
What is the Resource Investment Index for South Middle School?
South Middle School has a Resource Investment Index of 49/100 (higher reported resources relative to schools nationally) based on 3 factors: student-teacher ratio, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does South Middle School rank among public schools in Arlington Heights?
By Resource Investment Index, South Middle School ranks #7 of 13 public schools in Arlington Heights, 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 Arlington Heights on the city page.
Is South Middle School a good school?
South Middle School earns 49/100 on the Resource Investment Index, with class sizes near the Illinois median. 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 Arlington Heights Sd 25?
Besides South Middle School, Arlington Heights Sd 25 also operates Thomas Middle School (1,024 students), Olive-Mary Stitt School (671 students), and Westgate Elem School (633 students). See the Arlington Heights Sd 25 district page for the complete list.