Guest, Sign inJoin

Post to Brookhaven

We’ll email a one-tap link to publish your post. No password, and nothing is public until you click it.
Already a member? Sign in
B

William Sidney Mount Elementary School

PublicElementaryGrades PK–6

50 Dean Ln, Stony Brook, NY 11790 · (631) 730-4300 · Part of Three Village Central School District

Brookhaven’s School Grade B better than 62% of New York school districts

Directions
Students
525
Students per teacher
13:1
Free or reduced lunch
20%
Setting
Suburb
Grades
PK–6
The gist

What stands out about William Sidney Mount Elementary School

  • Its own letter, B: better results than 62% of New York’s public schools
  • Math proficiency 11 pts above the state
  • Enrollment up 15.4% since 2020–21

Test scores

2020–21
Math proficiency67%
State average 56.1%
Reading / language arts67%
State average 62.6%

Its own letter, B, places these results among New York’s 4,095 public schools with results. Source: EDFacts via Urban Institute Education Data Portal (SY2020-21).

Location

Directions ↗

50 Dean Ln, Stony Brook

Students

Enrollment by grade
Pre-K39
Kindergarten61
Grade 161
Grade 261
Grade 374
Grade 481
Grade 575
Grade 673
Enrollment over time
455’20
470’21
511’22
514’23
525’24

Up 15.4% since 2020–21.

Who goes here
White 55%Asian 24%Hispanic 14%Two or more races 5%Black 1%

As reported to NCES, share of students with a reported race or ethnicity.

Parents talk

Questions and answers about William Sidney Mount Elementary School from Brookhaven families.

Other schools in Three Village Central School District

The district →
Minnesauke Elementary School
Elementary · Grades PK–6 · East Setauket
A−
644 students12:1
Setauket Elementary School
Elementary · Grades PK–6 · Setauket
A−
599 students12:1
Arrowhead Elementary School
Elementary · Grades PK–6 · East Setauket
B
562 students11:1
Nassakeag Elementary School
Elementary · Grades PK–6 · East Setauket
A
551 students13:1
Robert Cushman Murphy Junior High School
Middle · Grades 7–9 · Stony Brook
B+
655 students10:1
Paul J Gelinas Junior High School
Middle · Grades 7–9 · Setauket
A
651 students10:1

School facts: U.S. Department of Education (NCES), 2024–2025 school year. Test scores: EDFacts via Urban Institute Education Data Portal (SY2020-21). A school’s letter is our own summary of its reading and math results against New York’s other public schools; Brookhaven’s School Grade is built from its districts’ results. Map: © OpenStreetMap contributors.