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SCHOOL COMMUNITY·WEST WINDSOR-PLAINSBORO REGIONAL SCHOOL DISTRICT·NCES 341770006077

Millstone River School

75 GROVERS MILL ROAD, PLAINSBORO, NJ 08536 · (609) 716-5500 · Middlesex County
GRADES 03–05ELEMENTARY41-RURALREGULAR SCHOOL772 STUDENTS
B+
allk12 Grade
Scored higher than 69% of New Jersey public elementary schools
  • A-Test scores Share of students meeting the state standard in reading, math, and other tested subjects, 2023-24 and 2024-25.
  • B-Beats expectations How far test scores land above or below what the share of low-income students predicts for a school in this state.
  • ·Three-year trend Not available for this school, so the grade uses the other parts.

Grades compare a school only with schools in the same state, because every state gives its own test. How grades work · Top-graded New Jersey public elementary schools

Enrollment
772
Elementary
DISTRICT 580 · STATE 405
Student : Teacher
9.2:1
84 FTE teachers
DISTRICT 10.8:1 · STATE 11.4:1
Free / Reduced Lunch
10%
81 students
DISTRICT 10% · STATE 41%
Community
1
0 members
Enrollment and student:teacher ratio compared against other elementary schools. Free/Reduced Lunch and demographics compared against all schools.

Enrollment by grade, 2024-25

GradeStudentsShare
Grade 314719%
Grade 429138%
Grade 533443%
Student demographics
40%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 45% · STATE 71% · US 70%
White
638%
DISTRICT 12% · STATE 37% · US 43%
Hispanic
405%
DISTRICT 6% · STATE 35% · US 30%
Black
395%
DISTRICT 5% · STATE 14% · US 15%
Asian
59076%
DISTRICT 72% · STATE 10% · US 6%
Two+
344%
DISTRICT 4% · STATE 3% · US 5%
Native American
61%
DISTRICT 0% · STATE 0% · US 1%
Student head counts by race/ethnicity from federal NCES enrollment data. District, state, and US figures are each group's share of all public school students in that area (US excludes territories). Very small groups may be suppressed in the source, so categories do not always sum exactly to total enrollment.
Gender split
Male
43757%
Female
33543%

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Test scores

NJSLA 2024-25 . % Meeting or Exceeding Expectations
English Language Arts
65.4%
NJ avg 53.1% . +0.4pp since 2023
Math
66.9%
NJ avg 41.6% . -0.4pp since 2023

What this means: On the NJSLA, New Jersey's statewide test, about 65 of every 100 students at this school read and write at grade level and about 67 of 100 do math at grade level. Across all New Jersey schools, those numbers are about 53 and 42. Reading and writing scores have held steady since 2023, while math scores have held steady.

NJSLA results by year

School yearEnglish Language ArtsMath
2024-2565.4%66.9%
2023-2465.0%67.3%
% Meeting or Exceeding Expectations, all students and all tested grades.
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
62.0%
composite math + reading, all grades
Predicted
60.4%
based on NJ schools with similar FRL share
Beats by
+1.6pp
above demographic expectation

What this means: About 62% of students here test proficient in math and reading, compared with the roughly 60% 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%.

BeatsExpectations runs a per-state regression of proficiency on free/reduced-lunch share, then scores each school by residual. How this is calculated →

Schools most like Millstone River School

Millstone River School's state test result (62.0% proficient) is higher than 0 of the 5 schools below with a result.

SchoolStudentsLow-incomeProficient
Millstone River School this school77210.5%62.0%
Woodbrook Elementary School
EDISON
78613.9%71.3%
Oak Tree Elementary School
MONROE TOWNSHIP
5787.6%78.6%
Martin Luther King Elementary School
EDISON
59114.7%73.8%
Village Elementary School
West Windsor
6577.6%69.6%
James Madison Intermediate School
EDISON
58614.2%76.0%
Matched among New Jersey elementary schools on enrollment, the share of students from low-income families (eligible for free or reduced-price lunch), and racial and ethnic makeup. Proficient is the average share of students meeting the state standard across all of the school's state tests in 2023-24 and 2024-25, the same combined score our test-score rankings use. Online schools and schools serving specialized populations are not matched.

Where Millstone River School ranks

Among elementary schools
MeasureThis schoolIn New JerseyIn Middlesex County
State test proficiency
ranked highest first
62.0%#296 of 1,290#26 of 111
Math proficiency
ranked highest first
66.9%#295 of 1,319
▼ 38
#22 of 111
▲ 3
Reading proficiency
ranked highest first
65.4%#377 of 1,319
▼ 30
#25 of 111
▲ 3
Enrollment
ranked largest first
772#68 of 1,562#7 of 130
Students per teacher
ranked fewest first
9.2:1#169 of 1,390#18 of 120
Diversity index
ranked most diverse first
40.2%#1,045 of 1,392#95 of 121
Free and reduced lunch
ranked highest share first
10.5%#1,239 of 1,481#120 of 128
Enrollment change since 2017-18
ranked steepest decline first
-29.0%#61 of 798#13 of 84
Ranked against other public elementary schools. Online schools are left out of every list, and test-score lists leave out schools that serve specialized populations. Each rank links to the full list. Arrows under a test-score rank show places moved since the prior test year, among schools tested both years.

4-year change

SY 2020-21 vs SY 2024-25
Enrollment
772
-195 (-20%) vs 2020
-37% since 1990-91, when it was 1,216
Student : Teacher
9.2:1
was 11.9:1
Source: NCES Common Core of Data

Enrollment and staffing by year

School yearStudentsTeachers (FTE)Students per teacherFree and reduced lunch
2024-2577283.89.2:110% (81)
2023-248137910.3:19% (72)
2022-2383183.410.0:17% (60)
2020-219678111.9:16% (61)
2017-181,08886.812.5:16% (67)
2015-161,0518212.8:17% (71)
2010-118895815.3:16% (49)
2000-011,3668516.1:14% (60)
1990-911,2166817.9:1N/A
Source: NCES Common Core of Data. Rows are the federal collections on file for Millstone River School.

Since 2017-18: students down 29% (1,088 to 772); teachers down 4% (86.8 to 83.8).

About Millstone River School

As a high-enrollment elementary school, Millstone River School serves students in PLAINSBORO, New Jersey. The school reports 772 students in grades 3 through 5. The typical figure for elementary schools in New Jersey is about 405 students.

Millstone River School is among 10 schools run by West Windsor-Plainsboro Regional School District, which serves 8,831 students.

Roughly 76% of students at Millstone River School are Asian. Other groups make up 8% White, 5% Hispanic, 5% Black, and 4% multiracial. County-wide, 26% of Middlesex County residents are Asian. The school's diversity index is 40%, meaning two students picked at random have a 40% chance of belonging to different racial or ethnic groups.

Teachers at Millstone River School total 83.8 full-time equivalents, and the ratio is 9.2:1. That is 2.2 students per teacher below the 11.4:1 average for elementary schools in New Jersey. Federal records put free or reduced-price lunch eligibility at 10%. That is 32 points below the 42% average for public schools in Middlesex County.

allk12 grades Millstone River School a B+. The grade compares the school only with New Jersey public elementary schools, because each state gives its own test.

Millstone River School's actual average proficiency rate on state tests (62.0%) and its predicted rate (60.4%) put it outside the top and bottom 10% of New Jersey schools.

Millstone River School is located in Middlesex County, where the median household income is $111,549, the share of adults with a bachelor's degree or higher is 46%, and roughly 6% of residents are in poverty. Besides Millstone River School, Middlesex County has 213 other public schools.

The closest other public school is Community Middle School, about 0.2 miles away. Millstone River School has at least 8 other public schools within five miles. Local comparison: Millstone River School ranks 8th of 8 nearby schools, at 62.0% versus a 72.5% average.

For locale, NCES codes Millstone River School as Rural: Fringe.

Compared with 2020-21, the school had 195 fewer students in 2024-25. In 2020-21, the student-to-teacher ratio was 11.9:1; by 2024-25 it was 9.2:1.

Parents and students can post about sports tryouts, band and choir, and theater at Millstone River School. Alumni can share how the school prepared them.

Middlesex County at a glance

View full county profile
Population
871,290
Census ACS
Median income
$111,549
Household, ACS
Bachelor's+
46%
Adults 25+
Poverty rate
6%
Below federal line
Schools in county
214
129,255 students

Quick facts

School name
Millstone River School
District
West Windsor-Plainsboro Regional School District
Address
75 GROVERS MILL ROAD, PLAINSBORO, NJ 08536
Phone
(609) 716-5500
County
Middlesex County
Level
Elementary
Grade range
03–05
Total enrollment
772
Teachers (FTE)
84
Student–teacher ratio
9.2:1
Free and reduced lunch
81 (10%)
Locale
41-Rural: Fringe
NCES ID
341770006077
Charter school
No
Virtual school
No

Related schools

Other schools in West Windsor-Plainsboro Regional School District
Other schools in PLAINSBORO
Nearby schools

Frequently asked questions

About Millstone River School
What is the total enrollment at Millstone River School?
Millstone River School enrolls approximately 772 students in grades 03-05.
What age range does Millstone River School serve?
Millstone River School serves students from grade 03 through grade 05.
How many students per teacher at Millstone River School?
Approximately 9.2:1 students per teacher at Millstone River School.
How diverse is Millstone River School?
Millstone River School reports a student body of 8% White, 5% Hispanic, 5% Black, 76% Asian, 4% Two or more.
Who oversees Millstone River School?
Millstone River School is overseen by West Windsor-Plainsboro Regional School District in Middlesex County.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.
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