Total enrollment
748
+31 (+4%) vs SY 2020-21
2 schools in Mountainside
New Jersey · Public K-12
Mountainside sits inside New Jersey with 2 public K-12 schools, combined enrollment of about 748, and a mix of 1 elementary and 1 middle.
4-year change in Mountainside
SY 2020-21 vs SY 2024-25School count
2
0 (0%) vs SY 2020-21
Source: NCES Common Core of Data, enrollment-weighted demographic averages
Residents
7,049
all ages · ACS 5-yr
Students
748
public K-12 · NCES
Schools
2
public K-12
| Name | Level | Grades | Enrollment |
|---|---|---|---|
| Beechwood School | Elementary | PK-02 | 265 |
| Deerfield Elementary School | Middle | 03-08 | 483 |
About Mountainside
Mountainside is a compact New Jersey city in terms of public-school footprint, with 2 schools and 748 students total.
On the school-mix side, the city is made up of 1 elementary, and 1 middle.
Per-school enrollment runs near 374, below the state mean of about 540.
Trend over the past 4 years. Across the same 4-year window, public-school enrollment expanded 4%: 717 students in SY 2020-21 versus 748 in SY 2024-25.
On this page, the community for Mountainside discusses sports rivalries, cross-district programs, and shared facilities. Anyone with firsthand knowledge of these schools is welcome to weigh in.