Welcome to the Mountainside Public Library

The Library will be closed on Thursday, Nov. 27 and Friday, Nov. 28 in observance of Thanksgiving Day.
Happy Thanksgiving from the Board of Trustees and Staff of the Mountainside Public Library! 
Please note that the Library will be closed on the morning of Thursday, December 4, 2014 for a technology upgrade.  We will open to the public at 1:00 PM.


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.



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...

Looking for audio books or ebooks? 
Click on the eLibraryNJ banner.

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