William Sidney Mount Elementary School
Stony Brook, NY · Three Village Central School District
Regular public school · Grades PK-6 · Suburb, large
882nd of 2,326 New York elementary schools statewide · better than 62%▼ Declining
50 DEAN LN, Stony Brook, NY 11790
(631)730-4300NCES ID 362820003810Directory 2023–24
SchoolRow ranks William Sidney Mount Elementary School 882nd of 2,326 New York elementary schools for 2024–25, based on NYSED 3-8 assessments 2024–25; high schools: Regents 65+ rate English and Math results — better than 62% of elementary schools statewide. Its statewide percentile went from 87th in 2019 to 62th in 2025 — declining.
Percent meeting or exceeding the state standard, NYSED 3-8 assessments 2024–25; high schools: Regents 65+ rate
Racial and ethnic breakdown of 514 students (2023–24, NCES) — history since 1988, with comparable seven-category changes from 2010
| Group | Trend | 2010 | 2023 | Change |
|---|---|---|---|---|
| White | 84.1% | 56.8% | ▼ 27.3 pts | |
| Asian | 10.9% | 23.7% | ▲ 12.8 pts | |
| Hispanic | 2.9% | 12.8% | ▲ 9.9 pts | |
| Two or more races | 0.0% | 5.1% | ▲ 5.1 pts | |
| Black | 1.8% | 1.6% | ▼ 0.2 pts |
NCES history for this school begins in 1988. Race categories changed by 2010: earlier data combines Asian and Pacific Islander students and does not consistently identify multiracial students. The chart retains that history, while the change table uses 2010 onward.
Typical home value $778K in zip 11790 as of 2026-05 · trend since 2000
Data Provided by Zillow Group
Closest same-level schools, with 2024–25 state rank · ▲▼ = points better or worse than William Sidney Mount Elementary School
- #482Mills Pond Elementary SchoolSmithtown Central School District · 1.3 mi away482nd of 2,326
ELA 75% ▲16 · Math 72% ▲5Compare - #1115Saint James Elementary SchoolSmithtown Central School District · 1.4 mi away1,115th of 2,326
ELA 58% ▼1 · Math 57% ▼10Compare - #230Nassakeag Elementary SchoolThree Village Central School District · 2 mi away230th of 2,326
ELA 82% ▲23 · Math 82% ▲15Compare - #2157Eugene Auer Memorial SchoolMiddle Country Central School District · 2.3 mi away2,157th of 2,326
ELA 24% ▼35 · Math 32% ▼35Compare - #459Minnesauke Elementary SchoolThree Village Central School District · 2.6 mi away459th of 2,326
ELA 70% ▲11 · Math 79% ▲12Compare - #1526Oxhead Road SchoolMiddle Country Central School District · 2.7 mi away1,526th of 2,326
ELA 46% ▼13 · Math 48% ▼19Compare - #611Wenonah SchoolSachem Central School District · 3.2 mi away611th of 2,326
ELA 69% ▲10 · Math 71% ▲4Compare - #642Dogwood Elementary SchoolSmithtown Central School District · 3.2 mi away642nd of 2,326
ELA 68% ▲9 · Math 70% ▲3Compare
What school district is William Sidney Mount Elementary School in?
William Sidney Mount Elementary School is part of the Three Village Central School District district in Stony Brook, New York.
Is William Sidney Mount Elementary School a good school?
SchoolRow ranks William Sidney Mount Elementary School 882nd of 2,326 New York elementary schools (better than 62% statewide) based on 2024–25 test results (NYSED 3-8 assessments 2024–25; high schools: Regents 65+ rate).
What is the racial makeup of William Sidney Mount Elementary School?
White 57%, Asian 24%, Hispanic 13%, Two or more races 5% (514 students, 2023–24).
How much do homes near William Sidney Mount Elementary School cost?
The typical home value in zip code 11790 is $778K as of 2026-05 (Zillow ZHVI).
Sources: state education department data (NYSED 3-8 assessments 2024–25; high schools: Regents 65+ rate, low-income, chronic absenteeism), National Center for Education Statistics via the Urban Institute (enrollment, demographics, staffing), Zillow Group (home values). Rankings are computed by SchoolRow from state English and Math results within grade level; they measure test performance, not everything that makes a school good.