Welcome to the Mountainside Public Library 




Library Hours

Monday: 10am to 9pm

Tuesday: 9:30am to 9pm

Wednesday: 9:30am to 5pm

Thursday: 9:30am to 9pm

Friday: 9:30am to 5pm

*Saturday: 9:30am to 5pm

Sunday: Closed

*Closed Saturdays from

July through Labor Day

 Holiday Closings 2017
January 2: New Years Day (Observed)
January 16: MLK Birthday
February 20: Presidents' Day
April 14: Good Friday
May 29: Memorial Day

July 3: Independence Day (Observed)
July 4: Independence Day 
September 4: Labor Day
October 9: Columbus Day

November 10: Veterans' Day (Observed)
November 11: Veterans' Day
November 23: Thanksgiving Day
November 24: Day after Thanksgiving
December 25: Christmas Day
December 26: Day after Christmas

Holiday Closings 2018

January 1: New Year's Day 

Mountainside Public Library
1 Constitution Plaza
Mountainside, NJ  07092






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The Mountainside Public Library is the proud first recipient of the
LUCCy Award!

The Libraries of Union County Consortium (LUCC) awards the LUCCy yearly to a Public Library in Union County to honor Excellence in Library Service.  Read more...