Enrollment
285
Elementary
DISTRICT 333 · STATE 405
SCHOOL COMMUNITY·MONTVILLE TOWNSHIP SCHOOL DISTRICT·NCES 341065004342
William Mason School
5 SHAWNEE TRAIL, MONTVILLE, NJ 07045 · (973) 331-7100 · Morris County
GRADES KG–05ELEMENTARY21-SUBURBREGULAR SCHOOL285 STUDENTS
B+
allk12 Grade
Scored higher than 67% 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.
- C+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
Student : Teacher
9.3:1
31 FTE teachers
DISTRICT 10.5:1 · STATE 11.4:1
Free / Reduced Lunch
4%
11 students
DISTRICT 3% · STATE 41%
Community
0
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
| Grade | Students | Share |
|---|---|---|
| Kindergarten | 45 | 16% |
| Grade 1 | 41 | 14% |
| Grade 2 | 54 | 19% |
| Grade 3 | 44 | 15% |
| Grade 4 | 48 | 17% |
| Grade 5 | 53 | 19% |
This year's kindergarten class (45) is 15% smaller than its 5th grade class (53).
Student demographics
45%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 60% · STATE 71% · US 70%
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
School pathway
Students here typically continue to
Based on grade levels within Montville Township School District. Attendance zones can vary; confirm enrollment with the district.
Test scores
NJSLA 2024-25 . % Meeting or Exceeding ExpectationsEnglish Language Arts
68.8%
NJ avg 53.1% . -1.0pp since 2023
Math
61.1%
NJ avg 41.6% . -6.0pp since 2023
What this means: On the NJSLA, New Jersey's statewide test, about 69 of every 100 students at this school read and write at grade level and about 61 of 100 do math at grade level. Across all New Jersey schools, those numbers are about 53 and 42. Reading and writing scores are down about 1 points since 2023, while math scores are down about 6 points.
NJSLA results by year
| School year | English Language Arts | Math |
|---|---|---|
| 2024-25 | 68.8% | 61.1% |
| 2023-24 | 69.8% | 67.1% |
% 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 · methodologyTier
AS EXPECTED
Performing as predicted given the school's student profile
Actual proficiency
63.5%
composite math + reading, all grades
Predicted
64.0%
based on NJ schools with similar FRL share
Beats by
-0.6pp
below demographic expectation
What this means: About 64% of students here test proficient in math and reading, compared with the roughly 64% 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 William Mason School
William Mason School's state test result (63.5% proficient) is higher than 0 of the 4 schools below with a result.
| School | Students | Low-income | Proficient |
|---|---|---|---|
| William Mason School this school | 285 | 3.9% | 63.5% |
| Washington Avenue School CHATHAM | 286 | 3.8% | 79.3% |
| Washington Elementary School Westfield | 300 | 1.0% | 79.0% |
| McKinley Elementary School Westfield | 291 | 2.1% | 68.8% |
| Milton Avenue School CHATHAM | 301 | 2.7% | 92.7% |
| Lincoln Early Childhood Center Westfield | 268 | 3.0% | N/A |
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 William Mason School ranks
Among elementary schools| Measure | This school | In New Jersey | In Morris County |
|---|---|---|---|
| State test proficiency ranked highest first | 63.5% | #272 of 1,290 | #38 of 76 |
| Math proficiency ranked highest first | 61.1% | #385 of 1,319 ▼ 122 | #50 of 77 ▼ 14 |
| Reading proficiency ranked highest first | 68.8% | #293 of 1,319 ▼ 40 | #35 of 77 ▼ 1 |
| Enrollment ranked largest first | 285 | #1,167 of 1,562 | #69 of 92 |
| Students per teacher ranked fewest first | 9.3:1 | #185 of 1,390 | #11 of 89 |
| Diversity index ranked most diverse first | 44.8% | #942 of 1,392 | #65 of 89 |
| Free and reduced lunch ranked highest share first | 3.9% | #1,369 of 1,481 | #70 of 90 |
| Enrollment change since 2017-18 ranked fastest growth first | +18.3% | #116 of 545 | #13 of 40 |
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 2024-25Enrollment
285
+46 (+19%) vs 2020
+26% since 1990-91, when it was 227
Student : Teacher
9.3:1
was 9.2:1
Source: NCES Common Core of Data
Enrollment and staffing by year
| School year | Students | Teachers (FTE) | Students per teacher | Free and reduced lunch |
|---|---|---|---|---|
| 2024-25 | 285 | 30.6 | 9.3:1 | 4% (11) |
| 2023-24 | 290 | 32.3 | 9.0:1 | 5% (15) |
| 2022-23 | 277 | 33.1 | 8.4:1 | 4% (10) |
| 2020-21 | 239 | 26 | 9.2:1 | 3% (8) |
| 2017-18 | 241 | 26.3 | 9.2:1 | 2% (4) |
| 2015-16 | 273 | 26 | 10.5:1 | 2% (5) |
| 2010-11 | 314 | 19 | 16.5:1 | 0% (0) |
| 2000-01 | 350 | 19 | 18.4:1 | 1% (3) |
| 1990-91 | 227 | 14 | 16.2:1 | N/A |
Source: NCES Common Core of Data. Rows are the federal collections on file for William Mason School.
Since 2017-18: students up 18% (241 to 285); teachers up 17% (26.3 to 30.6).
About William Mason School
William Mason School is a small elementary school. Its address is in MONTVILLE, New Jersey. It offers kindergarten through 5 and has 285 students enrolled. That is 30% below the average of about 405 students for elementary schools in New Jersey.
The Montville Township School District system has 7 schools and 3,500 students.
At William Mason School, 72% of students are White. The remaining students are 13% Asian, 11% Hispanic, and 3% multiracial. Census estimates put Morris County at about 68% White, close to the school's figure. On the diversity index, which measures the chance that two random students are from different groups, William Mason School scores 45%.
William Mason School reported 30.6 full-time-equivalent teachers in 2024-25, a ratio of 9.3:1. By comparison, the average for elementary schools in New Jersey is 11.4:1. There are 11 students eligible for free or reduced-price lunch, 4% of enrollment. That is lower than the 19% average for public schools in Morris County.
Among New Jersey public elementary schools, William Mason School outscored 67%, which works out to a B+ on the allk12 Grade.
William Mason School is within a point of its predicted average proficiency rate across its state test results (63.5% versus 64.0%), which places it in neither the top nor the bottom 10% in New Jersey.
In Morris County, where the school is located, the median household earns about $137,326 a year, 58% of adults hold a bachelor's degree or higher, and about 3% of people live in poverty. Counting William Mason School, Morris County has 156 public schools.
William Mason School is about 1.9 miles from Boonton High School, its nearest public school. William Mason School has at least 8 other public schools within five miles. William Mason School ranks 6th of 8 among nearby schools on average proficiency, with 63.5% against a local average of 64.6%.
The NCES locale for William Mason School is Suburb: Large, which covers schools in a suburban area outside a principal city, within an urbanized area with a population of 250,000 or more.
Enrollment increased 19% over 4 years, reaching 285 in 2024-25.
The allk12 page for William Mason School lets the school community talk about athletics, class schedules, and weather closures. You can also rate the school on this page.
Morris County at a glance
View full county profilePopulation
514,528
Census ACS
Median income
$137,326
Household, ACS
Bachelor's+
58%
Adults 25+
Poverty rate
3%
Below federal line
Schools in county
156
72,239 students
Quick facts
Related schools
Other schools in Montville Township School District
- Montville Township High SchoolHigh · 1,035 students
- Robert R Lazar Middle SchoolMiddle · 798 students
- Woodmont SchoolElementary · 366 students
- Valley View SchoolElementary · 360 students
- Cedar Hill SchoolElementary · 329 students
- Hilldale SchoolElementary · 327 students
Other schools in MONTVILLE
- Montville Township High SchoolHigh · 1,035 students
- Robert R Lazar Middle SchoolMiddle · 798 students
Nearby schools
- Boonton High School1.9 mi · 646
- School Street School2.0 mi · 325
- John Hill School2.0 mi · 556
- Robert R Lazar Middle School2.3 mi · 798
- Rockaway Valley School2.4 mi · 396
- Cedar Hill School2.4 mi · 329
Frequently asked questions
About William Mason SchoolHow large is William Mason School?
William Mason School enrolls approximately 285 students in grades KG-05.
What age range does William Mason School serve?
William Mason School serves students from grade KG through grade 05.
How many students per teacher at William Mason School?
Approximately 9.3:1 students per teacher at William Mason School.
How diverse is William Mason School?
William Mason School reports a student body of 72% White, 11% Hispanic, 1% Black, 13% Asian, 3% Two or more.
Who oversees William Mason School?
William Mason School is overseen by Montville Township School District in Morris County.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.