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SCHOOL COMMUNITY·MOUNTAINSIDE SCHOOL DISTRICT·NCES 341104005588

Deerfield Elementary School

302 CENTRAL AVENUE, MOUNTAINSIDE, NJ 07092 · (908) 232-8828 · Union County
GRADES 03–08MIDDLE21-SUBURBREGULAR SCHOOL483 STUDENTS
Enrollment
483
Middle
DISTRICT 374 · STATE 578
Student : Teacher
10.7:1
45 FTE teachers
DISTRICT 12.0:1 · STATE 10.9:1
Free / Reduced Lunch
3%
14 students
DISTRICT 3% · STATE 41%
Community
1
0 members
Enrollment and student:teacher ratio compared against other middle schools. Free/Reduced Lunch and demographics compared against all schools.
Enrollment by grade
Grade 3
76
Grade 4
92
Grade 5
74
Grade 6
77
Grade 7
83
Grade 8
81
Student demographics
White
33569%
DISTRICT 69% · STATE 37%
Hispanic
6513%
DISTRICT 13% · STATE 35%
Black
41%
DISTRICT 1% · STATE 14%
Asian
429%
DISTRICT 9% · STATE 10%
Two+
357%
DISTRICT 8% · STATE 3%
Native American
10%
DISTRICT 0% · STATE 0%
Pacific Islander
10%
DISTRICT 0% · STATE 0%
Student head counts by race/ethnicity from federal NCES enrollment data. Very small groups may be suppressed in the source, so categories do not always sum exactly to total enrollment.
Gender split
Male
24651%
Female
23749%

Discussions

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Test scores

NJSLA 2024-25 . % Meeting or Exceeding Expectations
English Language Arts
82.0%
NJ avg 53.1% . +1.4pp since 2023
Math
78.9%
NJ avg 41.6% . +3.5pp since 2023
Source: NJSLA. All students, all grades. See all years and grades →

BeatsExpectations

Demographically-adjusted score · methodology
Tier
AS EXPECTED
Performing as predicted given the school's student profile
Actual proficiency
73.6%
composite math + reading, all grades
Predicted
64.6%
based on NJ schools with similar FRL share
Beats by
+9.1pp
above demographic expectation
BeatsExpectations runs a per-state regression of proficiency on free/reduced-lunch share, then scores each school by residual. How this is calculated →

7-year change

SY 2017-18 vs SY 2024-25
Enrollment
483
-7 (-1%) vs 2017
Student : Teacher
10.7:1
was 10.7:1
% White
69%
was 83%
% Hispanic
13%
was 7%
% Black
1%
was 1%
% Asian
9%
was 8%
Source: NCES Common Core of Data

About 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.

On allk12, the page collects discussion, questions, and updates around classroom updates, athletics, and weather closures. The community welcomes input from current and former families.

Union County at a glance

View full county profile
Population
579,290
Census ACS
Median income
$103,202
Household, ACS
Bachelor's+
39%
Adults 25+
Poverty rate
7%
Below federal line
Schools in county
180
99,046 students

Quick facts

School name
Deerfield Elementary School
District
Mountainside School District
Address
302 CENTRAL AVENUE, MOUNTAINSIDE, NJ 07092
Phone
(908) 232-8828
County
Union County
Level
Middle
Grade range
03–08
Total enrollment
483
Teachers (FTE)
45
Student–teacher ratio
10.7:1
Free/Reduced lunch
14 (3%)
Locale
21-Suburb: Large
NCES ID
341104005588
Charter school
No
Virtual school
No

Related schools

Other schools in Mountainside School District
Other schools in MOUNTAINSIDE
Nearby schools

Frequently asked questions

About Deerfield Elementary School
What is the total enrollment at Deerfield Elementary School?
Deerfield Elementary School enrolls approximately 483 students in grades 03-08.
What age range does Deerfield Elementary School serve?
Deerfield Elementary School serves students from grade 03 through grade 08.
How many students per teacher at Deerfield Elementary School?
Approximately 10.7:1 students per teacher at Deerfield Elementary School.
How diverse is Deerfield Elementary School?
Deerfield Elementary School reports a student body of 69% White, 13% Hispanic, 1% Black, 9% Asian, 7% Two or more.
What district is Deerfield Elementary School in?
Deerfield Elementary School is part of Mountainside School District.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.
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