Serving 525 students in grades Prekindergarten-6, William Sidney Mount Elementary School ranks in the top 30% of all schools in New York for overall test scores (math proficiency is top 30%, and reading proficiency is top 30%).
The percentage of students achieving proficiency in math is 65-69% (which is higher than the New York state average of 52%). The percentage of students achieving proficiency in reading/language arts is 55-59% (which is higher than the New York state average of 49%).
The student-teacher ratio of 13:1 is higher than the New York state level of 11:1.
Minority enrollment is 45% of the student body (majority Asian), which is lower than the New York state average of 61% (majority Hispanic).
Quick Facts (26-27)
- Grades: Prekindergarten-6
- Enrollment: 525 students
- Student-Teacher Ratio: 13:1
- Minority Enrollment: 45%
- Overall Testing Rank: Top 30% in NY
- Math Proficiency: 65-69% (Top 30%)
- Reading Proficiency: 55-59% (Top 50%)
- Science Proficiency: ≥90% (Top 30%)
- Attendance Zone: William Sidney Mount School serves the southwest part of East Setauket, NY, encompassing an area of approximately 4 square miles. Families in this zone can expect a typical drive to the school of about 5 to 10 minutes, with the furthest edge being around 2.2 miles away.
- Source: National Center for Education Statistics (NCES), NY Dept. of Education
School Overview
William Sidney Mount Elementary School's student population of 525 students has grown by 15% over five school years.
The teacher population of 40 teachers has stayed relatively flat over five school years.
Grades Offered
Grades Prekindergarten-6
(Supplemental Virtual)
(Supplemental Virtual)
Total Students
525 students
Showing 2016–2025. Full 39-year historical data available below ↓
Total Classroom Teachers
40 teachers
Showing 2016–2025. Full 39-year historical data available below ↓
School Calendar
School Rankings
William Sidney Mount Elementary School ranks within the top 30% of all 4,346 schools in New York (based off of combined math and reading proficiency testing data).
The diversity score of William Sidney Mount Elementary School is 0.62, which is less than the diversity score at state average of 0.73. The school's diversity has stayed relatively flat over five school years.
Overall Testing Rank
#1142 out of 4346 schools
(Top 30%)
(Top 30%)
Showing 2013–2023. Full 14-year historical data available below ↓
Math Test Scores (% Proficient)
65-69%
52%
Showing 2013–2023. Full 14-year historical data available below ↓
Reading/Language Arts Test Scores (% Proficient)
55-59%
49%
Showing 2012–2022. Full 13-year historical data available below ↓
Science Test Scores (% Proficient)
≥90%
78%
Student-Teacher Ratio
13:1
11:1
Showing 2016–2025. Full 39-year historical data available below ↓
Asian
25%
10%
Showing 2016–2025. Full 37-year historical data available below ↓
Hispanic
14%
31%
Showing 2016–2025. Full 36-year historical data available below ↓
Black
1%
15%
Showing 2016–2025. Full 37-year historical data available below ↓
White
55%
39%
Showing 2016–2025. Full 37-year historical data available below ↓
Two or more races
5%
4%
Showing 2016–2025. Full 13-year historical data available below ↓
All Ethnic Groups
Showing 2016–2025. Full 37-year historical data available below ↓
Chronically Absent Students
(22-23)11.4%
34.8%
Participates in the National School Lunch Program (NSLP)
Yes
Eligible for Free Lunch
19%
55%
Showing 2015–2025. Full 32-year historical data available below ↓
Eligible for Reduced Lunch
1%
2%
Showing 2014–2025. Full 26-year historical data available below ↓
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), NY Dept. of Education
Frequently Asked Questions
What is William Sidney Mount Elementary School's ranking?
William Sidney Mount Elementary School is ranked #1142 out of 4,346 schools, which ranks it among the top 30% of public schools in New York.
What schools are William Sidney Mount Elementary School often compared to?
William Sidney Mount Elementary Schoolis often viewed alongside schools like Nassakeag Elementary School, Minnesauke Elementary School, Setauket Elementary School by visitors of our site.
What percent of students have achieved state testing proficiency in math and reading?
65-69% of students have achieved math proficiency (compared to the 52% NY state average), while 55-59% of students have achieved reading proficiency (compared to the 49% NY state average).
How many students attend William Sidney Mount Elementary School?
525 students attend William Sidney Mount Elementary School.
What is the racial composition of the student body?
55% of William Sidney Mount Elementary School students are White, 25% of students are Asian, 14% of students are Hispanic, 5% of students are Two or more races, and 1% of students are Black.
What is the student-teacher ratio of William Sidney Mount Elementary School?
William Sidney Mount Elementary School has a student ration of 13:1, which is higher than the New York state average of 11:1.
What grades does William Sidney Mount Elementary School offer ?
William Sidney Mount Elementary School offers enrollment in grades Prekindergarten-6 (Supplemental Virtual).
What school district is William Sidney Mount Elementary School part of?
William Sidney Mount Elementary School is part of Three Village Central School District.
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