50 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
Merrilleen Heidrich, Assistant Principal

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

School Drop-Off/Pick-Up Procedure

Building Security Information


Valentines for the Vets

2nd grade students in Ms. Kenny, Ms. Fizzuoglio, and Ms. Pushee's classes made Valentines to be delivered to the Stony Brook Veterans Home!



  Myachi at Mount 



 Please click here for information regarding the Chitty Chitty Bang Bang Performance at Gelinas Junior High School

October is Fire Prevention Month


 On October 16th the Stony Brook Fire Department visited Mount Elementary School to teach the children about Fire Safety.  Thank you to all the Stony Brook Fire Department Volunteers for coming and spending time with the students!  The children enjoyed learning about the importance of fire prevention!


Hip Pickles Come to Mount to kick off the 2015 - 2016 School Year! 

Thank you to the Mount PTA for this fun event that taught students about treating others the way they would like to be treated in a fun and interactive way!




Article: Keeping Kids Cool at School 


2015-2016 Supply Lists 

(Now located on side navigation)





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.   



Current News

Mount Learns Myachi

One for the Record Books

Students from Minnesauke, Setauket and W.S. Mount elementary schools, as well as P.J. Gelinas and R.C. Murphy junior high schools, helped to break the Guinness World Record for the most horns performing on stage at one time during this year’s SCMEA Day of Horn.

The record was originally 180, held by a group of Pakistani sheep hornists, but this year’s SCMEA group surpassed that with more than 270 players on stage.

History Experts

W.S. Mount Elementary School fifth- and sixth-grade students had the chance to answer questions of historical importance as they participated in the National History Bee.  

More than 60 students took the contest’s written test, from which 25 semifinalists were selected for the competition’s oral round. Sixth-graders Neal Carpino, Matthew Chen and Ari Zucker emerged as the school winners and are now eligible to participate in the online qualifying exam. Their scores on that exam will determine whether they advance to the regional finals and compete in one of the 39 buzzer competitions across the United States.  

Cheery Performances

W.S. Mount Elementary School’s wind ensemble and chamber orchestra traveled to the Long Island State Veterans Home to spread holiday cheer.
The half-hour musical program was followed by a meet and greet with residents, where students gave cards and pictures from the Mount Art Club to the residents. The students found it to be an unforgettable experience and a heartwarming way to beginning the winter break.

Saturday, February 13, 2016   |  District Home