- Enrollment
- 2,589
- Students per teacher
- 14.6:1
- Resource Index
- 41/100
Elementary school (grades K-5) · Naperville, IL
Mill Street Elem School
Federal NCES profile for Mill Street Elem School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 42/100.
2024-25 NCES dataElementary school (grades K-5)NCES 172771002937
👥 S:T ratio 49
🌟 Gifted program 30
📋 Attendance 46
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Mill Street Elem School earns 42/100 on the Resource Investment Index, with class sizes near the Illinois median. It is also more racially and ethnically mixed than most Illinois schools.
- #22 of 27
- elementary schools in Naperville · Resource Index
- 42
- Resource Index · Typical
- 12.8:1
- students per teacher
- 600
- students enrolled
Mill Street Elem School has class sizes near the Illinois median. Computed live against every Illinois school reporting to NCES.
By Resource Investment Index, Mill Street Elem School ranks #22 of 27 elementary schools in Naperville, IL.
School address
District: Naperville Cusd 203 · Illinois
NCES ID 172771002937 Verify on NCES CCD record →
NCES CCD universe card
School universe 172771002937 · Naperville, IL Elementary · MID · TRAD
600 enr · 12.8:1 · RII 42
Nearest enrollment peer: Naperville Central High School (2,589 students)
Resource Investment Index #22 of 27 elementary schools in Naperville. NCES Common Core of Data stamps for this campus. Read with this school → · District book → · Illinois schools → · Find another →
Mill Street Elem School in the enrollment neighbourhood
Fall enrollment among this campus and nearest district peers
- Naperville Cen
Naperville Central High School
2,589 students
- Naperville Nor
Naperville North High School
2,467 students
- Kennedy Junior 937
Kennedy Junior High School
937 students
- Jefferson Jr H 832
Jefferson Jr High School
832 students
- Lincoln Jr Hig 774
Lincoln Jr High School
774 students
- This school 600
Mill Street Elem School
600 students
What this shows Mill Street Elem School reports 600 students on the CCD universe file.
How Mill Street Elem School compares
Mill Street Elem 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 | 12.8:1 | ▼ 9% | 14:1 | 15.7:1 |
| Enrollment | 600 | top 21% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
12.8:1
Leaner classes than 68% of US schools, among the more generously staffed nationally.
600
Bigger than 73% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Staffing depth
12.8:1
students per teacher
- 9% below state mean
Top 39% in Illinois - lower ratio than 61% of state schools
Well under the widely cited 15:1 individualized-attention benchmark, among the leaner class loads nationally.
Engagement
21.5%
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
$22,199
per pupil, district-wide
- above Illinois avg of $18,196
Well above the U.S. public-school average, reflecting substantially 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.
Student demographics
White 46.3%
Hispanic or Latino 20.3%
Asian 15.8%
African American 10.5%
Two or More 6.8%
American Indian / Alaska Native 0.2%
Largest group: White at 46.3% of enrollment.
Student-body diversity index 70.4/100
Simpson diversity index - at 70.4, Mill Street Elem School is more mixed than the Illinois school average of 38.9.
Programs
Funding & spending
District-wide per-pupil expenditure for Naperville Cusd 203, which includes Mill Street Elem School.
$22,199
Per student
+22%
vs Illinois
Avg $18,196
+26%
vs U.S.
Avg $17,658
Revenue mix
Local 69.9%
State 25.6%
Federal 4.4%
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 Mill Street Elem School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Naperville Central High School | Larger | No free-lunch data | Higher S:T ratio |
| Naperville North High School | Larger | No free-lunch data | Similar S:T ratio |
| Kennedy Junior High School | Larger | No free-lunch data | Higher S:T ratio |
| Jefferson Jr High School | Larger | No free-lunch data | Similar S:T ratio |
| Lincoln Jr High School | Larger | No free-lunch data | Similar S:T ratio |
Comparisons are relative to Mill Street Elem School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 2,467
- Students per teacher
- 13.5:1
- Resource Index
- 36/100
- Enrollment
- 937
- Students per teacher
- 14.4:1
- Resource Index
- 54/100
- Enrollment
- 832
- Students per teacher
- 12.8:1
- Resource Index
- 42/100
- Enrollment
- 774
- Students per teacher
- 13.8:1
- Resource Index
- 44/100
Similar elementary schools in Naperville
6 comparable elementary schools (grades K-5) serving the same city.
Elmwood Elem School
Standard public school
726 students 16.1:1 students per teacher
May Watts Elementary School
Standard public school
668 students 19.1:1 students per teacher
Steeple Run Elem School
Standard public school
622 students 13.2:1 students per teacher
Beebe Elem School
Standard public school
619 students 14.1:1 students per teacher
Mary Lou Cowlishaw Elementary
Standard public school
589 students 13.7:1 students per teacher
Ranch View Elementary School
Standard public school
584 students 15.4:1 students per teacher
Nationwide elementary 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 (~600 students)
Frequently asked questions about Mill Street Elem School
How many students attend Mill Street Elem School?
Mill Street Elem School has 600 students enrolled. It is an elementary school in Naperville, IL.
What is the student-teacher ratio at Mill Street Elem School?
The student-teacher ratio at Mill Street Elem School is 12.8:1, which is 9% lower than the Illinois average of 14:1 and 18% 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 Mill Street Elem School?
The largest demographic group at Mill Street Elem School is White at 46.3% of enrollment, in Naperville, IL. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 70.4/100.
What is the Resource Investment Index for Mill Street Elem School?
Mill Street Elem School has a Resource Investment Index of 42/100 (typical 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 Mill Street Elem School rank among elementary schools in Naperville?
By Resource Investment Index, Mill Street Elem School ranks #22 of 27 elementary schools in Naperville, IL. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all elementary schools in Naperville on the city page.
What other schools are in Naperville Cusd 203?
Besides Mill Street Elem School, Naperville Cusd 203 also operates Naperville Central High School (2,589 students), Naperville North High School (2,467 students), and Kennedy Junior High School (937 students). See the Naperville Cusd 203 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.