Welcome to the Mountainside Public Library

The Mountainside Public Library is located on Constitution Plaza in Mountainside, New Jersey. The library features a large selection of books, periodicals, movies, music, audiobooks and reference resources. There are also public computer workstations, free wireless Internet access, a community meeting room, a children's center and regularly scheduled entertainment and educational events.


To search our catalog, or access your account, please click the catalog icon below.



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 2015
January 1: New Years Day

January 2: Day after New Year's
January 19: MLK Birthday
February 16: Presidents' Day
April 3: Good Friday
May 25: Memorial Day
July 4: Independence Day
September 7: Labor Day
October 12: Columbus Day
November 11: Veterans' Day
November 26: Thanksgiving Day
November 27: Day after Thanksgiving
December 24: Christmas Eve: Close at 1pm
December 25: Christmas Day

Mountainside Public Library
1 Constitution Plaza
Mountainside, NJ  07092





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...

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Click on the eLibraryNJ banner.

Upcoming Events