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WILLIAM SIDNEY MOUNT ELEMENTARY SCHOOL — School Calendar 2026-27
Primary|EAST SETAUKET, New York|THREE VILLAGE CENTRAL SCHOOL DISTRICT
EAST SETAUKET, NY 11733
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School Profile
Grades
PK–6
Enrollment
514
Student:Teacher
13.9:1
Locale
Suburban
Econ. Disadvantaged
20.0%
Phone
(631)730-4300School Statistics
Academics (SY 2020-21)
Math Proficiency
65-69%
Chronic Absenteeism
7.6%
SY 2019-20
Technology & Internet Access (SY 2021-22)
Wi-Fi
Campus-wide wireless
Fiber Internet
High-speed connection
470
Connected devices
Staff & Support Services (SY 2021-22)
Teachers (FTE)
41
100% fully certified
Psychologists
1
Social Workers
1
Nurses
2
Security Staff
4
Anti-Bullying Policy
District Finance (FY 2023)
Per-Pupil Spending
$36,894
Total current expenditure
Instruction Spending
$24,467
Per pupil, classroom only
Total Revenue/Pupil
$40,267
All funding sources
Funding Sources
Federal 1%State 26%Local 73%
District-level data from NCES F-33 Survey
Community Context
Median Home Value
$456,345
+4.2% 1yr+45.0% 5yr
Hudson, NY metro area
Community Need Level
Moderate
CDC/ATSDR Social Vulnerability Index 2022
Neighborhood Indicators (Census Tract)
10.6%
Below 150% poverty line
4.8%
Unemployment rate
4.4%
Uninsured residents
9.7%
No HS diploma (25+)
Special Education (IDEA)
District-level data from IDEA Part B · Students ages 3-21 served under IDEA
Total Students Served
874
Ages 3-21 under IDEA
School-Age (6-21)
775
Receiving special ed services
Est. % of Enrollment
100%
District rate, school may vary
Disability Categories (District)
Speech/Language Impairment
209 (27%)
Other Health Impairment
185 (24%)
Autism
170 (22%)
Specific Learning Disability
129 (17%)
Emotional Disturbance
40 (5%)
Intellectual Disability
12 (2%)
Source: U.S. Department of Education, IDEA Section 618 Data · District-level counts · Individual school figures may differ
Enrollment Trend (2014-2025)
525
Current enrollment
Stable(+10% 5yr)Frequently Asked Questions about WILLIAM SIDNEY MOUNT ELEMENTARY SCHOOL
As of the most recent data, 514 students are enrolled at WILLIAM SIDNEY MOUNT ELEMENTARY SCHOOL. It is a Primary school within the local district.
Calendar Guides
School profiles: Data from NCES Common Core of Data. Calendar events from district calendar sources, updated automatically. · How we verify this data