Enrollment
483
New Jersey · 2024-25 NCES data
Elementary school (grades K-5) · Mountainside, NJ
Deerfield Elementary School
Federal NCES profile for Deerfield Elementary School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 56/100.
2024-25 NCES dataElementary school (grades K-5)NCES 341104005588
👥 S:T ratio 61
🌟 Gifted program 70
🎓 Counselors 3
📋 Attendance 88
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Deerfield Elementary School earns 56/100 on the Resource Investment Index, with class sizes smaller than 78% of New Jersey schools.
- 56
- Resource Index · Higher
- 9.7:1
- small classes for New Jersey
- 2.1%
- free-lunch eligible
- 483
- students enrolled
Deerfield Elementary School has class sizes smaller than 78% of New Jersey schools. Computed live against every New Jersey school reporting to NCES.
School address
District: Mountainside School District · New Jersey
NCES ID 341104005588 Verify on NCES CCD record →
Teachers (FTE)
50.0
Federal CCD staff survey
Students per teacher
9.7:1
vs 11.8:1 New Jersey avg
-18% vs state
Free-lunch eligible
2.1%
vs 29.6% New Jersey avg
-93% vs state
Student-teacher ratio in context
How Deerfield Elementary School compares with New Jersey and U.S. medians
What stands out at Deerfield Elementary School
Deerfield Elementary School is a lower-poverty, mid-sized elementary school in Mountainside, New Jersey, enrolling 483 students.
Class sizes run a bit leaner than typical: 9.7:1 puts it in the smaller third of New Jersey schools by student-teacher ratio.
Comparatively few students face economic hardship here, 2.1% free-meal eligibility runs 93% below the New Jersey average.
With 483 students, its enrollment sits close to the New Jersey median campus size.
Its Resource Investment Index sits near the middle of the pack among 2,501 scored New Jersey schools.
Against 586 statewide peers matched on enrollment and economic need, it ranks mid-pack at #272.
Its student body is led by White (69%) and Hispanic or Latino (14%) (diversity index 49/100).
Counselor access is stretched at roughly 483 students per counselor, well above the ASCA-recommended 250:1 ceiling.
Attendance holds up well here: only 4.8% of students were chronically absent, below the typical post-pandemic national figure.
The federal civil-rights collection also records 1 expulsion at this campus for 2021-22.
Its district, Mountainside School District, also runs Beechwood School (265 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 Deerfield Elementary School compares
Deerfield Elementary School on the metrics families compare, against New Jersey and U.S. means.
| Metric | This school | vs New Jersey | New Jersey avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 9.7:1 | ▼ 18% | 11.8:1 | 15.7:1 |
| Free-lunch eligible | 2.1% | ▼ 93% | 29.6% | 51.7% |
| Enrollment | 483 | top 42% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
9.7:1
Leaner classes than 90% of US schools, among the more generously staffed nationally.
483
Bigger than 59% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
2.1%
free-lunch eligible
- 93% below the New Jersey average of 29.6%
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
9.7:1
students per teacher
- 18% below state mean
Top 22% in New Jersey - lower ratio than 78% of state schools
Well under the widely cited 15:1 individualized-attention benchmark, among the leaner class loads nationally.
Engagement
4.8%
chronically absent (missed 10%+ of school days)
Below 5%, comfortably under the pre-pandemic national baseline for chronic absenteeism.
Funding equity
$22,138
per pupil, district-wide
- below New Jersey avg of $24,984
Well above the U.S. public-school average, reflecting substantially higher local or state investment per enrolled student.
Support staff
Counselors1.0 FTE
Per 483 students, the combined health-and-guidance staffing load for this school.
Discipline context
6
in-school suspensions + 1 out-of-school
Suspension rate: 1.2 per 100 students. Combined in-school and out-of-school rate: 1.4 per 100 students. Reported via the Civil Rights Data Collection. Includes 1 expulsion.
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 69.4%
Hispanic or Latino 13.5%
Asian 8.7%
Two or More 7.2%
African American 0.8%
American Indian / Alaska Native 0.2%
Native Hawaiian / Pacific Islander 0.2%
Largest group: White at 69.4% of enrollment.
Student-body diversity index 48.7/100
Simpson diversity index - at 48.7, Deerfield Elementary School is less mixed than the New Jersey school average of 51.2.
Programs
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for Mountainside School District, which includes Deerfield Elementary School.
$22,138
Per student
-11%
vs New Jersey
Avg $24,984
+33%
vs U.S.
Avg $16,593
Revenue mix
Local 77.0%
State 19.5%
Federal 3.4%
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 Deerfield Elementary School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Beechwood School | Smaller | Similar economic need | Higher S:T ratio |
Comparisons are relative to Deerfield Elementary School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 265
- Students per teacher
- 12.6:1
- Resource Index
- 63/100
Similar elementary schools statewide
Matched by enrollment size and by staffing ratio across all of New Jersey, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~483 students)
Similar student-teacher ratio (~9.7:1)
Next steps
Verify locally before acting on Deerfield Elementary School's federal record.
- Compare Deerfield Elementary School against another school. Compare schools
- Mountainside 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 Deerfield Elementary School
How many students attend Deerfield Elementary School?
Deerfield Elementary School has 483 students enrolled. It is an elementary school in Mountainside, NJ.
What is the student-teacher ratio at Deerfield Elementary School?
The student-teacher ratio at Deerfield Elementary School is 9.7:1, which is 18% lower than the New Jersey average of 11.8:1 and 38% 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 Deerfield Elementary School?
2.1% of students at Deerfield Elementary School are eligible for free lunch, compared to the New Jersey average of 29.6%.
What is the racial and ethnic makeup of Deerfield Elementary School?
The largest demographic group at Deerfield Elementary School is White at 69.4% of enrollment, in Mountainside, NJ.
What is the Resource Investment Index for Deerfield Elementary School?
Deerfield Elementary School has a Resource Investment Index of 56/100 (higher 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).
Is Deerfield Elementary School a good school?
Deerfield Elementary School earns 56/100 on the Resource Investment Index, with class sizes smaller than 78% of New Jersey 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 Mountainside School District?
Besides Deerfield Elementary School, Mountainside School District also operates Beechwood School (265 students). See the Mountainside 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.