50 Dean Lane, Stony Brook NY 11790 Phone: (631) 730-4300  |  Fax: (631) 730-4309 IMPORTANT PHONE NUMBERS: Attendance/Health Office: 730-4310 Transportation Office: 730-5070, Fax: 730-5095 Weather Related Closing Information: 730-4050 Nathalie C. Lilavois, Principal Brigit DiPrimo, Assistant to the Principal   School Hours: 9:25 a.m.-3:40 p.m. School Drop-Off/Pick-Up Procedure Building Security Information

Presentation on the District's IG & PI Programs

Schedule for the Last 3 Half Days of School

 

 Warm Weather Attire Letter

Parent Social Media Letter

William Sidney Mount School is one of five elementary schools located in the Three Village School District in Stony Brook, NY.  Currently, we house grades kindergarten through sixth grade.

US Dept. of Education designates WS Mount as a Blue Ribbon School!!
Click here for more information.  Visit the Dept of Education website.
Click here to watch the video!


Please be sure to check the Calendar and the Parent Notices regularly for important updates throughout the school year.