Jefferson Elementary vs South Mountain School
A head-to-head comparison of two schools in New Jersey, United States, 1.6 km apart, using official American 2025 data. The better value in each row is highlighted.
Jefferson Elementary
Union · Public middle · Grades 5–5
564 students
South Mountain School
Millburn · Public elementary · Grades PK–4
278 students
| Measure | Jefferson Elementary Union, New Jersey | South Mountain School Millburn, New Jersey |
|---|---|---|
| Success Index (US) | 59 Top 50% | 95 Top 5% |
| State rank | #294 of 440 | #20 of 1,479 |
| National rank | #5681 of 15,369 | #73 of 50,301 |
| Sector | Public | Public |
| Type | Middle | Elementary |
| Year range | Grades 5–5 | Grades PK–4 |
| Students | 564 | 278 |
| Enrollment | 564 | 278 |
| Free/reduced-price lunch | 52.7% | 2.9% |
| Students per teacher | 13.8 | 9.9 |
| Reading proficiency | 58% | 82% |
| Math proficiency | 45% | 82% |
| city | Union | Millburn |
| state | New Jersey | New Jersey |
| Website | – | – |
The verdict
- •South Mountain School scores higher on the Success Index (US) (95.4 vs 59.1).
- •South Mountain School does better on math proficiency (82% vs 45%).
- •South Mountain School does better on reading proficiency (82% vs 58%).
- •South Mountain School does better on community advantage (fewer free/reduced-price lunch) (2.9% vs 52.7%).
- •South Mountain School does better on students per teacher (9.9 vs 13.8).
- •Jefferson Elementary is the larger school with 564 students compared with 278.
The Success Index (US) summarises published results and context from official data. It does not measure teaching quality or fit. Methodology.
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Frequently asked questions
Is Jefferson Elementary better than South Mountain School?
On the Success Index (US), South Mountain School ranks higher (95.4 vs 59.1 out of 100). The index is built from published results and context data, not from teaching quality or fit, so visit both schools before deciding.
How far apart are Jefferson Elementary and South Mountain School?
About 1.6 km in a straight line, between Union and Millburn in New Jersey.
Which has the better Enrollment?
Jefferson Elementary: 564. South Mountain School: 278. Students enrolled in the latest NCES directory year.
How do Jefferson Elementary and South Mountain School rank in New Jersey?
Jefferson Elementary is 294th of 440 and South Mountain School is 20th of 1,479 among middle schools in New Jersey on the 2025 Success Index (US).