Enrollment
313
Illinois · 2024-25 NCES data
Elementary school (grades K-5) · Darien, IL
Cass Jr High School
Federal NCES profile for Cass Jr High School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 47/100.
2024-25 NCES dataElementary school (grades K-5)NCES 170879000519
👥 S:T ratio 48
🌟 Gifted program 70
🎓 Counselors 37
📋 Attendance 35
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Cass Jr High School earns 47/100 on the Resource Investment Index, with class sizes near the Illinois median.
- #2 of 7
- public schools in Darien · Resource Index
- 47
- Resource Index · Typical
- 13:1
- students per teacher
- 313
- students enrolled
Cass Jr High School has class sizes near the Illinois median. Computed live against every Illinois school reporting to NCES.
By Resource Investment Index, Cass Jr High School ranks #2 of 7 public schools in Darien, IL.
School address
Teachers (FTE)
24.0
Federal CCD staff survey
Students per teacher
13:1
vs 14:1 Illinois avg
-7% vs state
Student-teacher ratio in context
How Cass Jr High School compares with Illinois and U.S. medians
What stands out at Cass Jr High School
Cass Jr High School is a mid-sized elementary school in Darien, Illinois, enrolling 313 students.
At 13:1, its student-teacher ratio sits close to the Illinois median, within a few percentage points of the 14:1 state norm, neither notably crowded nor notably small.
With 313 students, its enrollment sits close to the Illinois median campus size.
Its Resource Investment Index lands in the upper third of 3,845 scored Illinois schools.
Its student body is led by White (65%) and Asian (13%) (diversity index 55/100).
Counselor coverage runs a bit thin, about 313 students per counselor, somewhat past the ASCA-recommended 250:1 benchmark.
Chronic absenteeism is elevated: 26.2% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
Among Darien's elementary schools, it stands alongside Lace Elem School (377 students): Cass Jr High School is smaller than that campus by headcount and runs heavier classes (13:1 vs 11.1:1).
Its district, Cass Sd 63, also runs Concord Elem School (460 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 Cass Jr High School compares
Cass Jr 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 | 13:1 | ▼ 7% | 14:1 | 15.7:1 |
| Enrollment | 313 | top 61% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
13:1
Leaner classes than 67% of US schools, among the more generously staffed nationally.
313
Bigger than 34% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Staffing depth
13:1
students per teacher
- 7% below state mean
Top 42% in Illinois - lower ratio than 58% of state schools
Well under the widely cited 15:1 individualized-attention benchmark, among the leaner class loads nationally.
Engagement
26.2%
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
$15,702
per pupil, district-wide
- below Illinois avg of $17,042
Somewhat below the U.S. average per-pupil spend; funding constraints may affect programs, facilities, and staffing.
Support staff
Counselors1.0 FTE
Per 313 students, the combined health-and-guidance staffing load for this school.
Discipline context
0
in-school suspensions + 5 out-of-school
Suspension rate: 0.0 per 100 students. Combined in-school and out-of-school rate: 1.6 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 64.5%
Asian 13.1%
Hispanic or Latino 12.5%
Two or More 5.8%
African American 3.8%
Native Hawaiian / Pacific Islander 0.3%
Largest group: White at 64.5% of enrollment.
Student-body diversity index 54.6/100
Simpson diversity index - at 54.6, Cass Jr High School is more mixed than the Illinois school average of 38.9.
Programs
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for Cass Sd 63, which includes Cass Jr High School.
$15,702
Per student
-8%
vs Illinois
Avg $17,042
-5%
vs U.S.
Avg $16,593
Revenue mix
Local 69.4%
State 24.1%
Federal 6.6%
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 Cass Jr High School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Concord Elem School | Larger | No free-lunch data | Similar S:T ratio |
Comparisons are relative to Cass Jr High School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 460
- Students per teacher
- 13.1:1
- Resource Index
- 40/100
Similar elementary schools in Darien
1 comparable elementary schools (grades K-5) serving the same city.
Similar elementary 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 (~313 students)
Similar student-teacher ratio (~13:1)
Next steps
Verify locally before acting on Cass Jr High School's federal record.
- Compare Cass Jr High School against another school. Compare schools
- Cass Sd 63'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 Cass Jr High School
How many students attend Cass Jr High School?
Cass Jr High School has 313 students enrolled. It is an elementary school in Darien, IL.
What is the student-teacher ratio at Cass Jr High School?
The student-teacher ratio at Cass Jr High School is 13:1, which is 7% lower than the Illinois average of 14:1 and 17% 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 Cass Jr High School?
The largest demographic group at Cass Jr High School is White at 64.5% of enrollment, in Darien, IL. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 54.6/100.
What is the Resource Investment Index for Cass Jr High School?
Cass Jr High School has a Resource Investment Index of 47/100 (typical reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, counselor availability, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Cass Jr High School rank among public schools in Darien?
By Resource Investment Index, Cass Jr High School ranks #2 of 7 public schools in Darien, 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 Darien on the city page.
Is Cass Jr High School a good school?
Cass Jr High School earns 47/100 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 Cass Sd 63?
Besides Cass Jr High School, Cass Sd 63 also operates Concord Elem School (460 students). See the Cass Sd 63 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.