Average
#1824 of 4,742 schools in NY
Top 38% in state
William Sidney Mount Elementary School
Elementary School · THREE VILLAGE CENTRAL SCHOOL DISTRICT
PO BOX 9050, East Setauket, NY 11733
Enrollment
514
Student-Teacher
13.9:1
Score
6.9
Grades
Pre-K – 6th
Enrollment
514
Student-Teacher
13.9:1
Score
6.9
Grades
Pre-K – 6th
Data vintage
2022-23
Data vintage2022-23
How this school compares
New York schools
#1,824 of 4,742
In East Setauket
#8 of 8
public schools
In district
#8 of 8
THREE VILLAGE CENTRAL SCHOOL DISTRICT
School environment
8.9 / 10
Excellent
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William Sidney Mount Elementary School
Elementary School in East Setauket · grades Pre-K – 6th. Start here, then compare fit against nearby and district options.
Mills Pond Elementary School
1.3 mi away. Use as a geographic alternative in the same move search.
Harbor Country Day School
1.1 mi away. Use as a geographic alternative in the same move search.
About William Sidney Mount Elementary School
William Sidney Mount Elementary School is a public elementary school in East Setauket, NY, part of THREE VILLAGE CENTRAL SCHOOL DISTRICT. William Sidney Mount Elementary School serves approximately 514 students, and covers grades Pre-K-6th, and has a 13.9:1 student-teacher ratio. William Sidney Mount Elementary School has a current MySchoolScout rating of 6.9 out of 10 and ranks #1,824 of 4,742 schools in NY.
Structured state assessment records for William Sidney Mount Elementary School show 73% math proficiency (multi-year average, 2009-2022) and 68% reading/ELA proficiency (multi-year average, 2009-2022).
- This school 6.9 · Average
- District avg 7.9
- NY avg 5.9
Score Breakdown
Full Profile · 3/3 metricsView breakdown
View breakdown
View breakdown
William Sidney Mount Elementary School — Students at William Sidney Mount Elementary School score 59% proficient, which is below what's typical for similar communities (expected: 62%).
Equity & Diversity
Shown separately, not included in overall scoreFree/Reduced Lunch
20%
Students qualifying for federal meal assistance
Test Scores NY EDFACTS (2021-22)
Based on 36 test records from NY state assessments. About our data
Proficiency Trend
↓ DecliningAverage proficiency (% at or above grade level) across Math & ELA over time.
* COVID-affected year — test participation was uneven nationwide. This data is weighted at 50% in the Growth score calculation.
Source: EdFacts (NCES) and state assessment data. Growth score: 5.7/10.
How William Sidney Mount Elementary School Compares
See how William Sidney Mount Elementary School performs across key quality dimensions compared to state benchmarks.
Funding & Resources
Location
PO BOX 9050, East Setauket, NY 11733
Nearby Alternatives
Families considering William Sidney Mount Elementary School may also want to explore other elementary schools in the area. NASSAKEAG ELEMENTARY SCHOOL (rated 9.2/10, 2.0 miles away), which scores notably higher. Another option is MINNESAUKE ELEMENTARY SCHOOL (rated 8.4/10, 2.6 miles away), which scores notably higher. Additionally, HARBOR COUNTRY DAY SCHOOL (rated 8.1/10, 1.1 miles away, in nearby Saint James), which scores notably higher. For more schools in East Setauket, see our East Setauket schools guide .
Nearby Schools
20 within 3.2 mi| School | Distance | Rating |
|---|---|---|
| MILLS POND ELEMENTARY SCHOOL St. James | 1.3 mi | 7.8 |
| HARBOR COUNTRY DAY SCHOOL Saint James | 1.1 mi | 8.1 |
| ROBERT CUSHMAN MURPHY JUNIOR HIGH SCHOOL East Setauket | 1.2 mi | 8.6 |
| SAINT JAMES ELEMENTARY SCHOOL Saint James | 1.4 mi | 7.4 |
| THE STONY BROOK SCHOOL Stony Brook | 2.0 mi | 6.7 |
| NORTH SHORE MONTESSORI SCHOOL Stony Brook | 2.0 mi | — |
| SS PHILIP & JAMES SCHOOL Saint James | 1.8 mi | 5.9 |
| NASSAKEAG ELEMENTARY SCHOOL East Setauket | 2.0 mi | 9.2 |
| EUGENE AUER MEMORIAL SCHOOL Lake Grove | 2.3 mi | 5.2 |
| SMITHTOWN HIGH SCHOOL EAST Saint James | 2.2 mi | 8.6 |
| MINNESAUKE ELEMENTARY SCHOOL East Setauket | 2.6 mi | 8.4 |
| WENONAH SCHOOL Lake Grove | 3.2 mi | 6.3 |
| NESAQUAKE MIDDLE SCHOOL Saint James | 2.6 mi | 7.2 |
| PAUL J GELINAS JUNIOR HIGH SCHOOL East Setauket | 3.2 mi | 8.9 |
| OXHEAD ROAD SCHOOL Centereach | 2.7 mi | 3.7 |
| DAWNWOOD MIDDLE SCHOOL Centereach | 2.8 mi | 5.2 |
| CENTEREACH HIGH SCHOOL Centereach | 2.9 mi | 8.2 |
| THE KNOX SCHOOL Saint James | 2.9 mi | 8.2 |
| TACKAN ELEMENTARY SCHOOL Nesconset | 3.7 mi | 8.0 |
| DOGWOOD ELEMENTARY SCHOOL Smithtown | 3.2 mi | 7.3 |
Neighborhood Census ACS (2019-2023)
Census data for ZIP 11733 (ACS 2019-2023 5-Year Estimates) · Data sources
Median Income
$174,931
Median Home Value
$653,100
Median Rent
$2,386/mo
Population
17,403
College Educated
62.9%
Homeownership
84.8%
Avg Commute
29.9 min
Poverty Rate
4.6%
Median Age
44.7
Similar Schools
Schools in the same state with comparable level, size, and ratings
| School | Rating |
|---|---|
| ALLEGANY-LIMESTONE ELEMENTARY SCHOOL Allegany, NY | 6.9 |
| BRONX COMMUNITY CHARTER SCHOOL Bronx, NY | 6.9 |
| BROOKLYN AVENUE SCHOOL Valley Stream, NY | 6.9 |
| CALCIUM PRIMARY SCHOOL Calcium, NY | 6.9 |
| CARYL E ADAMS PRIMARY SCHOOL Whitney Point, NY | 6.9 |
| CASIMIR PULASKI SCHOOL Scarsdale, NY | 6.9 |
Frequently Asked Questions
Common questions about William Sidney Mount Elementary School
What grades does William Sidney Mount Elementary School serve?
William Sidney Mount Elementary School serves students in grades Pre-K through 6th.
How many students attend William Sidney Mount Elementary School?
William Sidney Mount Elementary School has an enrollment of approximately 514 students.
What is the student-teacher ratio at William Sidney Mount Elementary School?
The student-teacher ratio at William Sidney Mount Elementary School is 13.9:1. A lower ratio generally means more individual attention per student. The national average is approximately 16:1 for public schools.
How does William Sidney Mount Elementary School rank in NY?
William Sidney Mount Elementary School ranks #1,824 of 4,742 schools in NY.
What is William Sidney Mount Elementary School's MySchoolScout rating?
William Sidney Mount Elementary School has a current MySchoolScout rating of 6.9 out of 10. This score combines the level-appropriate components shown in the rating breakdown; equity data is shown separately for context.
What are the test scores at William Sidney Mount Elementary School?
Based on loaded state assessment records, William Sidney Mount Elementary School has 73% math proficiency (multi-year average, 2009-2022) and 68% reading/ELA proficiency (multi-year average, 2009-2022).
Is William Sidney Mount Elementary School a charter school?
No, William Sidney Mount Elementary School is not a charter school. It is a traditional public school operated by the local school district.
Is William Sidney Mount Elementary School a Title I school?
No, William Sidney Mount Elementary School is not currently a Title I school.
What does the Free & Reduced Lunch percentage mean for William Sidney Mount Elementary School?
20.0% of students at William Sidney Mount Elementary School qualify for free or reduced-price lunch. This is a commonly used indicator of economic need and provides important context when interpreting test scores.
Neighborhood Context
Powered by 
Quick Facts NCES CCD (SY 2022-23)
- Grades
- Pre-K – 6th
- Enrollment
- 514
- Student-Teacher Ratio
- 13.9:1
- Teachers (FTE)
- 37
- Free/Reduced Lunch
- 20.0%
- Type
- regular
- Setting
- Large Suburb
- County
- Suffolk County
- Chronic Absenteeism (SY 2022-23)
- 11.7%
- Phone
- (631) 730-4300
Resources & Links
District
THREE VILLAGE CENTRAL SCHOOL DISTRICT- District Enrollment
- 5,686
- Schools in District
- 8
- Per-Pupil Spending
- $36,894
- District Rank
- #8 of 8
How we rate schools
A clear 1–10 score built from public data — growth, academics, and learning environment. No hidden criteria, no pay-to-play.
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