Enrollment
228
Illinois · 2024-25 NCES data
Other / mixed grade configuration · Lyons, IL
Costello School
Federal NCES profile for Costello School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 33/100.
2024-25 NCES dataOther / mixed grade configurationNCES 172385003902
👥 S:T ratio 68
🌟 Gifted program 30
📋 Attendance 0
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Costello School earns 33/100 on the Resource Investment Index, with class sizes smaller than 97% of Illinois schools.
- #2 of 3
- public schools in Lyons · Resource Index
- 33
- Resource Index · Typical
- 8.1:1
- small classes for Illinois
- 228
- students enrolled
Costello School has class sizes smaller than 97% of Illinois schools. Computed live against every Illinois school reporting to NCES.
By Resource Investment Index, Costello School ranks #2 of 3 public schools in Lyons, IL.
School address
Teachers (FTE)
28.0
Federal CCD staff survey
Students per teacher
8.1:1
vs 14:1 Illinois avg
-42% vs state
Student-teacher ratio in context
How Costello School compares with Illinois and U.S. medians
What stands out at Costello School
Costello School is a mid-sized combined-grade school in Lyons, Illinois, enrolling 228 students.
Classes run notably small here: at 8.1:1, Costello School is leaner than roughly 97% of Illinois schools and 42% under the state's 14:1 norm, more adult attention per pupil than most peers.
Enrollment of 228 puts it in the smaller third of Illinois schools by headcount.
Its Resource Investment Index lands in the lower third of 3,845 scored Illinois schools.
Its student body is predominantly Hispanic or Latino (84% of enrollment) (diversity index 29/100).
Chronic absenteeism is elevated: 45.6% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
Lyons Sd 103 also operates Washington Middle School (659 students) and Lincoln Elem School (366 students) alongside Costello 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 Costello School compares
Costello 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 | 8.1:1 | ▼ 42% | 14:1 | 15.7:1 |
| Enrollment | 228 | top 78% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
8.1:1
Leaner classes than 95% of US schools, among the more generously staffed nationally.
228
Bigger than 23% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Staffing depth
8.1:1
students per teacher
- 42% below state mean
Top 3% in Illinois - lower ratio than 97% of state schools
Well under the widely cited 15:1 individualized-attention benchmark, among the leaner class loads nationally.
Engagement
45.6%
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
$19,896
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
0
in-school suspensions + 0 out-of-school
Suspension rate: 0.0 per 100 students. Combined in-school and out-of-school rate: 0.0 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
Hispanic or Latino 83.8%
White 9.2%
African American 3.1%
Asian 1.8%
Two or More 1.8%
American Indian / Alaska Native 0.4%
Largest group: Hispanic or Latino at 83.8% of enrollment.
Student-body diversity index 28.8/100
Simpson diversity index - at 28.8, Costello School is less mixed than the Illinois school average of 38.9.
Programs
Funding & spending
District-wide per-pupil expenditure for Lyons Sd 103, which includes Costello School.
$19,896
Per student
+17%
vs Illinois
Avg $17,042
+20%
vs U.S.
Avg $16,593
Revenue mix
Local 55.6%
State 39.8%
Federal 4.6%
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 Costello School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Washington Middle School | Larger | No free-lunch data | Higher S:T ratio |
| Lincoln Elem School | Larger | No free-lunch data | Higher S:T ratio |
| Edison Elem School | Similar size | No free-lunch data | Higher S:T ratio |
| Home Elem School | Similar size | No free-lunch data | Higher S:T ratio |
| J W Robinson Jr Elem School | Similar size | No free-lunch data | Higher S:T ratio |
Comparisons are relative to Costello School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 659
- Students per teacher
- 11.4:1
- Resource Index
- 28/100
- Enrollment
- 366
- Students per teacher
- 10.2:1
- Resource Index
- 30/100
- Enrollment
- 282
- Students per teacher
- 11.8:1
- Resource Index
- 38/100
- Enrollment
- 256
- Students per teacher
- 11.6:1
- Resource Index
- 45/100
- Enrollment
- 251
- Students per teacher
- 10.5:1
- Resource Index
- 35/100
Similar other 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 (~228 students)
Similar student-teacher ratio (~8.1:1)
Next steps
Verify locally before acting on Costello School's federal record.
- Compare Costello School against another school. Compare schools
- Lyons Sd 103'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 Costello School
How many students attend Costello School?
Costello School has 228 students enrolled. It is a public school in Lyons, IL.
What is the student-teacher ratio at Costello School?
The student-teacher ratio at Costello School is 8.1:1, which is 42% lower than the Illinois average of 14:1 and 48% 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 Costello School?
The largest demographic group at Costello School is Hispanic or Latino at 83.8% of enrollment, in Lyons, IL.
What is the Resource Investment Index for Costello School?
Costello School has a Resource Investment Index of 33/100 (typical 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 Costello School rank among public schools in Lyons?
By Resource Investment Index, Costello School ranks #2 of 3 public schools in Lyons, 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 Lyons on the city page.
Is Costello School a good school?
Costello School earns 33/100 on the Resource Investment Index, with class sizes smaller than 97% of Illinois schools. 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 Lyons Sd 103?
Besides Costello School, Lyons Sd 103 also operates Washington Middle School (659 students), Lincoln Elem School (366 students), and Edison Elem School (282 students). See the Lyons Sd 103 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.