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Deerfield Elementary School
School pathway
Test scores
NJSLA 2024-25 . % Meeting or Exceeding ExpectationsWhat this means: On the NJSLA, New Jersey's statewide test, about 82 of every 100 students at this school read and write at grade level and about 79 of 100 do math at grade level. Across all New Jersey schools, those numbers are about 53 and 42. Reading and writing scores are up about 1 points since 2023, while math scores are up about 4 points.
BeatsExpectations
Demographically-adjusted score · methodologyWhat this means: About 74% of students here test proficient in math and reading, compared with the roughly 65% typical for New Jersey schools with a similar share of low-income students. BeatsExpectations measures results against demographically similar schools rather than by raw scores, and this school falls within the typical range, neither among New Jersey's top nor bottom 10%.
7-year change
SY 2017-18 vs SY 2024-25About Deerfield Elementary School
Deerfield Elementary School, a tight-knit 6-8 campus in MOUNTAINSIDE, New Jersey, run under Mountainside School District, enrolls 483 students, covering grades 3 through 8.
Deerfield Elementary School is one of 2 schools operated by Mountainside School District, a district that hosts 748 students overall.
In terms of who attends, Deerfield Elementary School reports that the largest single group is White, at 69% of enrollment; the rest reads as 13% Hispanic, 9% Asian, 7% multiracial. By comparison, Union County as a whole is about 39% White, so the school skews visibly more White than its surroundings.
In terms of school funding signals, The school reports having 45 full-time-equivalent teachers, for a student-teacher ratio near 10.7:1. The state averages about 10.9:1, putting this campus right in line with peers. Around 3% of the student body qualifies for free or reduced-price meals, which schools and policymakers use as a rough income-mix signal. Set against Union County (around 52%), the school's rate is meaningfully below typical.
On a residual basis (actual vs predicted given the student mix), Deerfield Elementary School sits in the middle band of the BeatsExpectations distribution. Schools with this campus's student mix typically land near 64.6%; this one delivers 73.6%.
In the broader community, ACS estimates for Union County put median household earnings sit near $103,202, about 39% of the adult population holds a bachelor's degree or above, and census figures put the poverty rate at about 7%. In all, Union County runs 180 public schools (combined enrollment of about 99,046 students), of which Deerfield Elementary School is one.
Nearest neighbor: Crossroads School, around 1.0 miles off. Counting just inside five miles, 8 other public schools cluster around Deerfield Elementary School. On composite proficiency, Deerfield Elementary School comes 3rd of 6 in the immediate cluster, above the nearby-schools average of 67.6%.
The school occupies a suburban site.
Five-year trend. Deerfield Elementary School's enrollment has showed little movement since 2018, when it stood at 490 (now 483). The White share of enrollment declined from 83% to 69% over that span.
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Union County at a glance
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