Enrollment
395
Michigan · 2024-25 NCES data
Other / mixed grade configuration · Troy, MI
Costello Elementary School
Federal NCES profile for Costello Elementary School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 38/100.
2024-25 NCES dataOther / mixed grade configurationNCES 263426006972
👥 S:T ratio 44
🌟 Gifted program 30
📋 Attendance 41
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Costello Elementary School earns 38/100 on the Resource Investment Index, with class sizes smaller than 76% of Michigan schools. It is also more racially and ethnically mixed than most Michigan schools.
- #2 of 7
- schools in Troy · Resource Index
- 38
- Resource Index · Typical
- 14.1:1
- small classes for Michigan
- 13.0%
- free-lunch eligible
Costello Elementary School has class sizes smaller than 76% of Michigan schools. Computed live against every Michigan school reporting to NCES.
By Resource Investment Index, Costello Elementary School ranks #2 of 7 schools in Troy, MI.
School address
District: Troy School District · Michigan
NCES ID 263426006972 Verify on NCES CCD record →
Teachers (FTE)
28.0
Federal CCD staff survey
Students per teacher
14.1:1
vs 17.5:1 Michigan avg
-19% vs state
Free-lunch eligible
13.0%
vs 54.3% Michigan avg
-76% vs state
Student-teacher ratio in context
How Costello Elementary School compares with Michigan and U.S. medians
What stands out at Costello Elementary School
Costello Elementary School is a lower-poverty, mid-sized combined-grade school in Troy, Michigan, enrolling 395 students.
Class sizes run a bit leaner than typical: 14.1:1 puts it in the smaller third of Michigan schools by student-teacher ratio.
Comparatively few students face economic hardship here, 13.0% free-meal eligibility runs 76% below the Michigan average.
With 395 students, its enrollment sits close to the Michigan median campus size.
Its Resource Investment Index lands in the upper third of 3,375 scored Michigan schools.
Against 313 statewide peers matched on enrollment and economic need, it ranks in the upper tier at #109.
Its student body is led by White (55%) and Asian (31%), more mixed than most schools in the state (diversity index 60/100).
Attendance runs somewhat below the norm, with 23.8% of students chronically absent per the 2021-22 civil-rights collection.
Troy School District also operates Troy High School (2,032 students) and Athens High School (1,468 students) alongside Costello Elementary 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 Elementary School compares
Costello Elementary School on the metrics families compare, against Michigan and U.S. means.
| Metric | This school | vs Michigan | Michigan avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 14.1:1 | ▼ 19% | 17.5:1 | 15.7:1 |
| Free-lunch eligible | 13.0% | ▼ 76% | 54.3% | 51.7% |
| Enrollment | 395 | top 42% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
14.1:1
Leaner classes than 56% of US schools, a middle-of-the-pack class size.
395
Bigger than 47% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
13.0%
free-lunch eligible
- 76% below the Michigan average of 54.3%
Below the 40% Title I threshold, among the lower-need profiles in the state; federal aid targets individual qualifying students rather than schoolwide programs.
Staffing depth
14.1:1
students per teacher
- 19% below state mean
Top 24% in Michigan - lower ratio than 76% of state schools
Close to the 15:1 benchmark most often cited for individualized attention.
Engagement
23.8%
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
$14,267
per pupil, district-wide
- above Michigan avg of $13,507
Somewhat below the U.S. average per-pupil spend; funding constraints may affect programs, facilities, and staffing.
Support staff
Counselors0.0 FTE
Student-support staffing from the Civil Rights Data Collection.
Discipline context
0
in-school suspensions + 3 out-of-school
Suspension rate: 0.0 per 100 students. Combined in-school and out-of-school rate: 0.8 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 54.9%
Asian 30.6%
Hispanic or Latino 6.3%
Two or More 5.8%
African American 1.8%
American Indian / Alaska Native 0.5%
Largest group: White at 54.9% of enrollment.
Student-body diversity index 59.7/100
Simpson diversity index - at 59.7, Costello Elementary School is more mixed than the Michigan school average of 36.2.
Programs
Funding & spending
District-wide per-pupil expenditure for Troy School District, which includes Costello Elementary School.
$14,267
Per student
+6%
vs Michigan
Avg $13,507
-14%
vs U.S.
Avg $16,593
Revenue mix
Local 39.2%
State 52.2%
Federal 8.6%
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 Elementary School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Troy High School | Larger | Similar economic need | Higher S:T ratio |
| Athens High School | Larger | Similar economic need | Higher S:T ratio |
| Larson Middle School | Larger | Similar economic need | Higher S:T ratio |
| Boulan Park Middle School | Larger | Similar economic need | Higher S:T ratio |
| Baker Middle School | Larger | Higher economic need | Higher S:T ratio |
Comparisons are relative to Costello Elementary School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 2,032
- Students per teacher
- 18.1:1
- Resource Index
- 42/100
- Enrollment
- 1,468
- Students per teacher
- 16.9:1
- Resource Index
- 42/100
- Enrollment
- 865
- Students per teacher
- 21.1:1
- Resource Index
- 31/100
- Enrollment
- 839
- Students per teacher
- 17.9:1
- Resource Index
- 40/100
- Enrollment
- 629
- Students per teacher
- 17:1
- Resource Index
- 35/100
Similar other schools statewide
Matched by enrollment size and by staffing ratio across all of Michigan, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~395 students)
Next steps
Verify locally before acting on Costello Elementary School's federal record.
- Compare Costello Elementary School against another school. Compare schools
- Troy School District'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 Elementary School
How many students attend Costello Elementary School?
Costello Elementary School has 395 students enrolled. It is a public school in Troy, MI.
What is the student-teacher ratio at Costello Elementary School?
The student-teacher ratio at Costello Elementary School is 14.1:1, which is 19% lower than the Michigan average of 17.5:1 and 10% lower than the national average of 15.7:1. Lower ratios generally mean more individual attention per student.
What percentage of students receive free lunch at Costello Elementary School?
13.0% of students at Costello Elementary School are eligible for free lunch, compared to the Michigan average of 54.3%.
What is the racial and ethnic makeup of Costello Elementary School?
The largest demographic group at Costello Elementary School is White at 54.9% of enrollment, in Troy, MI. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 59.7/100.
What is the Resource Investment Index for Costello Elementary School?
Costello Elementary School has a Resource Investment Index of 38/100 (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 Elementary School rank among schools in Troy?
By Resource Investment Index, Costello Elementary School ranks #2 of 7 schools in Troy, MI. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all schools in Troy on the city page.
Is Costello Elementary School a good school?
Costello Elementary School earns 38/100 on the Resource Investment Index, with class sizes smaller than 76% of Michigan schools. It is also more racially and ethnically mixed than most Michigan 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 Troy School District?
Besides Costello Elementary School, Troy School District also operates Troy High School (2,032 students), Athens High School (1,468 students), and Larson Middle School (865 students). See the Troy School District 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.