- Enrollment
- 1,024
- Students per teacher
- 14.2:1
- Resource Index
- 48/100
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 52
🌟 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 smaller than 70% of Illinois schools.
- #7 of 13
- public schools in Arlington Heights · Resource Index
- 49
- Resource Index · Higher
- 12.1:1
- small classes for Illinois
- 812
- students enrolled
South Middle School has class sizes smaller than 70% of Illinois schools. 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 →
NCES CCD universe card
School universe 170414000105 · Arlington Heights, IL Middle · MID · TRAD
812 enr · 12.1:1 · RII 49
Nearest enrollment peer: Thomas Middle School (1,024 students)
Resource Investment Index #7 of 13 public schools in Arlington Heights. NCES Common Core of Data stamps for this campus. Read with this school → · District book → · Illinois schools → · Find another →
South Middle School in the enrollment neighbourhood
Fall enrollment among this campus and nearest district peers
- Thomas Middle
Thomas Middle School
1,024 students
- This school
South Middle School
812 students
- Olive-Mary Sti
Olive-Mary Stitt School
671 students
- Westgate Elem
Westgate Elem School
633 students
- Ivy Hill Elem
Ivy Hill Elem School
593 students
- Dryden Elem Sc
Dryden Elem School
521 students
What this shows South Middle School reports 812 students on the CCD universe file.
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 | 12.1:1 | ▼ 14% | 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
12.1:1
Leaner classes than 75% 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
12.1:1
students per teacher
- 14% below state mean
Top 30% in Illinois - lower ratio than 70% 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
$18,806
per pupil, district-wide
- above Illinois avg of $18,196
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.
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
Funding & spending
District-wide per-pupil expenditure for Arlington Heights Sd 25, which includes South Middle School.
$18,806
Per student
+3%
vs Illinois
Avg $18,196
+7%
vs U.S.
Avg $17,658
Revenue mix
Local 69.9%
State 24.8%
Federal 5.3%
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 South Middle School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Thomas Middle School | Larger | No free-lunch data | Higher 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
- 671
- Students per teacher
- 16.4:1
- Resource Index
- 48/100
- Enrollment
- 633
- Students per teacher
- 13.5:1
- Resource Index
- 52/100
- Enrollment
- 593
- Students per teacher
- 16.5:1
- Resource Index
- 41/100
- Enrollment
- 521
- Students per teacher
- 16.3:1
- Resource Index
- 48/100
Similar middle schools in Arlington Heights
1 comparable middle schools (grades 6-8) serving the same city.
Nationwide middle 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 (~812 students)
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 12.1:1, which is 14% lower than the Illinois average of 14:1 and 23% 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, gifted-program reporting, chronic absenteeism. 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.
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.
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.