Welcome to the Mountainside Public Library

  • 1000 Books Before Kindergarten
  • Remember Pearl Harbor
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Library Hours

Monday: 10am to 9pm

Tuesday: 10am to 9pm

Wednesday: 10am to 5pm

Thursday: 10am to 9pm

Friday: 10am to 5pm

*Saturday: 10am to 5pm

Sunday: Closed

*Closed Saturdays from

July through Labor Day

Holiday Closings 2016
January 1: New Years Day

January 2: Day after New Year's
January 18: MLK Birthday
February 15: Presidents' Day
March 25: Good Friday
May 30: Memorial Day
July 4: Independence Day 
September 5: Labor Day
October 10: Columbus Day
November 11: Veterans' Day
November 24: Thanksgiving Day
November 25: Day after Thanksgiving
December 24: Christmas Eve
December 26: Day after Christmas
December 31: New Years Eve
January 2: New Year's Day (2017, Observed)

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...