Dean Lane, Stony Brook NY 11790
Phone: (631) 730-4300  |  Fax: (631) 730-4309

Attendance/Health Office: 730-4310
Transportation Office: 730-5070, Fax: 730-5095
Weather Related Closing Information: 730-4050

Kathryn White, Principal
Brian McCarthy, Interim Assistant to the Principal

School Hours: 9:25 a.m.-3:40 p.m.

School Drop-Off/Pick-Up Procedure

Building Security Information

  Newsletter-Spring 2014 

IG/PI Presentation 2014

 Mrs. Baldante's Fifth Grade Newsday Reporters Video!




 Common Core Assessment FAQ


A Parent's Guide to RTI

Before School Student Drop-off For Music and Extra Help

A Note to School
- Please click on the link provided to print a template for dismissal notes to be sent to the school.

Parent Social Media Letter

A Parent's Guide to the Common Core

Parent Portal Information - Kindergarten

Parent Portal Information - Grades 1-6

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.