Enrollment
278
New Jersey · 2024-25 NCES data
Other / mixed grade configuration · Millburn, NJ
South Mountain School
Federal NCES profile for South Mountain School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 73/100.
2024-25 NCES dataOther / mixed grade configurationNCES 341020000230
👥 S:T ratio 62
🌟 Gifted program 70
📋 Attendance 88
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
South Mountain School earns 73/100 on the Resource Investment Index, with class sizes smaller than 80% of New Jersey schools.
- #1 of 4
- public schools in Millburn · Resource Index
- 73
- Resource Index · Higher
- 9.6:1
- small classes for New Jersey
- 1.4%
- free-lunch eligible
South Mountain School has class sizes smaller than 80% of New Jersey schools. Computed live against every New Jersey school reporting to NCES.
By Resource Investment Index, South Mountain School ranks #1 of 4 public schools in Millburn, NJ.
School address
District: Millburn Township School District · New Jersey
NCES ID 341020000230 Verify on NCES CCD record →
Teachers (FTE)
29.0
Federal CCD staff survey
Students per teacher
9.6:1
vs 11.8:1 New Jersey avg
-19% vs state
Free-lunch eligible
1.4%
vs 29.6% New Jersey avg
-95% vs state
Student-teacher ratio in context
How South Mountain School compares with New Jersey and U.S. medians
What stands out at South Mountain School
South Mountain School is a lower-poverty, mid-sized combined-grade school in Millburn, New Jersey, enrolling 278 students.
Class sizes run a bit leaner than typical: 9.6:1 puts it in the smaller third of New Jersey schools by student-teacher ratio.
Comparatively few students face economic hardship here, 1.4% free-meal eligibility runs 95% below the New Jersey average.
Enrollment of 278 puts it in the smaller third of New Jersey schools by headcount.
Its Resource Investment Index outscores 99% of the 2,501 New Jersey schools with a score on record, a top-tier result on this measure.
Among 389 similarly sized, similarly resourced-need New Jersey schools statewide, it ranks #6, a top-tier result once campus size and economic need are matched.
Its student body is led by Asian (55%) and White (26%) (diversity index 62/100).
Attendance holds up well here: only 5.0% of students were chronically absent, below the typical post-pandemic national figure.
Millburn Township School District also operates Millburn High School (1,380 students) and Millburn Middle School (1,106 students) alongside South Mountain 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 South Mountain School compares
South Mountain 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 | 9.6:1 | ▼ 19% | 11.8:1 | 15.7:1 |
| Free-lunch eligible | 1.4% | ▼ 95% | 29.6% | 51.7% |
| Enrollment | 278 | top 79% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
9.6:1
Leaner classes than 91% of US schools, among the more generously staffed nationally.
278
Bigger than 29% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
1.4%
free-lunch eligible
- 95% 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
9.6:1
students per teacher
- 19% below state mean
Top 20% in New Jersey - lower ratio than 80% of state schools
Well under the widely cited 15:1 individualized-attention benchmark, among the leaner class loads nationally.
Engagement
5.0%
chronically absent (missed 10%+ of school days)
In the 5-10% range, close to the pre-pandemic national baseline.
Funding equity
$23,688
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
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
Asian 55.0%
White 26.3%
Two or More 8.3%
Hispanic or Latino 5.8%
African American 4.7%
Largest group: Asian at 55.0% of enrollment.
Student-body diversity index 61.6/100
Simpson diversity index - at 61.6, South Mountain School is more mixed than the New Jersey school average of 51.2.
Programs
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for Millburn Township School District, which includes South Mountain School.
$23,688
Per student
-5%
vs New Jersey
Avg $24,984
+43%
vs U.S.
Avg $16,593
Revenue mix
Local 73.9%
State 24.3%
Federal 1.8%
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 South Mountain School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Millburn High School | Larger | Similar economic need | Similar S:T ratio |
| Millburn Middle School | Larger | Similar economic need | Similar S:T ratio |
| Hartshorn School | Larger | Similar economic need | Higher S:T ratio |
| Washington School | Larger | Similar economic need | Higher S:T ratio |
| Deerfield School | Larger | No free-lunch data | Higher S:T ratio |
Comparisons are relative to South Mountain School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,380
- Students per teacher
- 10.7:1
- Resource Index
- 64/100
- Enrollment
- 1,106
- Students per teacher
- 10.6:1
- Resource Index
- 59/100
- Enrollment
- 392
- Students per teacher
- 11.5:1
- Resource Index
- 69/100
- Enrollment
- 363
- Students per teacher
- 11.3:1
- Resource Index
- 59/100
- Enrollment
- 358
- Students per teacher
- 11.9:1
- Resource Index
- 56/100
Similar other 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 (~278 students)
Similar student-teacher ratio (~9.6:1)
Next steps
Verify locally before acting on South Mountain School's federal record.
- Compare South Mountain School against another school. Compare schools
- Millburn Township 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 South Mountain School
How many students attend South Mountain School?
South Mountain School has 278 students enrolled. It is a public school in Millburn, NJ.
What is the student-teacher ratio at South Mountain School?
The student-teacher ratio at South Mountain School is 9.6:1, which is 19% lower than the New Jersey average of 11.8:1 and 39% 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 South Mountain School?
1.4% of students at South Mountain School are eligible for free lunch, compared to the New Jersey average of 29.6%.
What is the racial and ethnic makeup of South Mountain School?
The largest demographic group at South Mountain School is Asian at 55.0% of enrollment, in Millburn, NJ. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 61.6/100.
What is the Resource Investment Index for South Mountain School?
South Mountain School has a Resource Investment Index of 73/100 (higher 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 South Mountain School rank among public schools in Millburn?
By Resource Investment Index, South Mountain School ranks #1 of 4 public schools in Millburn, NJ. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all public schools in Millburn on the city page.
Is South Mountain School a good school?
South Mountain School earns 73/100 on the Resource Investment Index, with class sizes smaller than 80% 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 Millburn Township School District?
Besides South Mountain School, Millburn Township School District also operates Millburn High School (1,380 students), Millburn Middle School (1,106 students), and Hartshorn School (392 students). See the Millburn Township 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.