School District · New York
Mount Sinai Union Free School District
📍 Mount Sinai, NY · Suffolk County · NCES LEAID 3620040
Kindergarten – 12th
Grade Span
District Contact & InformationSource: NCES CCD 2024–25
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Grades Served
Kindergarten – 12th
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District Mailing Address
PO BOX 397, MOUNT SINAI, NY 11766
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NCES District ID (LEAID)
3620040
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District Type
Public School District
Zip Codes Served by Mount Sinai Union Free School District1 zip code
Frequently Asked Questions
What zip codes are in Mount Sinai Union Free School District?▼
Mount Sinai Union Free School District serves 1 zip code: 11766. Zip codes and district boundaries do not line up exactly, so confirm your exact address with the district office before you rely on an assignment.
How is Mount Sinai Union Free School District rated?▼
Mount Sinai Union Free School District has an overall rating of 8 out of 10 (Good), based on the share of students proficient in reading and math on state assessments (NCES EDFacts). That places it in the 76th percentile among New York school districts. Ratings are percentile-ranked within New York only and are not comparable across states.
How many students attend Mount Sinai Union Free School District?▼
The NCES Common Core of Data directory reports enrollment of 2,076 students across 3 schools for Mount Sinai Union Free School District.
What grades does Mount Sinai Union Free School District serve?▼
Mount Sinai Union Free School District is listed in the NCES directory as serving grades Kindergarten – 12th.
How do I contact Mount Sinai Union Free School District?▼
You can reach Mount Sinai Union Free School District by phone at (631)870-2550 or by mail at PO BOX 397, MOUNT SINAI, NY 11766. Contact details come from the NCES district directory and are the best way to confirm which school your address is assigned to.
About Mount Sinai Union Free School District
Mount Sinai Union Free School District is a public school district serving 1 zip code in New York, primarily in Suffolk County. It carries an overall rating of 8/10 (Good), the 76th percentile among New York districts. That rating reflects the share of students proficient in reading and math on state assessments (NCES EDFacts, 2021–22 for most districts with a 2017–18 fallback for the rest) and is ranked only against other New York districts — scores are not comparable between states. Directory details on this page come from the NCES Common Core of Data, 2024–25.
District boundaries are address-specific and do not follow zip code lines exactly — a single zip code can
be split between two or more districts. Use the zip codes listed above as a starting point, then confirm your
assignment with the district office at (631)870-2550 before making a housing decision.