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.