The Mountainside Public Library will be closed Saturday September 5th through Monday September 7th, in observance of Labor Day.  We will reopen on Saturdays from 10 AM to 5 Pm, beginning Saturday September 12th.

End of Summer 2015 DVD Special:

Enjoy your end of summer viewing at a special price!

From Monday August 31st through Friday, September 4th, enjoy a 3rd DVD for free, when you check out 2 at the regular price. 

At "3 for the price of 2", think of all the movies you could watch!

“Vintage Jewelry Sale”

The Friends of the Mountainside Public Library will be sponsoring a sale of pre-owned jewelry on Friday & Saturday, September 25 & 26, 10:00 AM to 5:00 PM. An eclectic assortment of vintage jewelry at low prices will be available; a perfect gift for that someone special or a treat for you! All proceeds benefit the Library.

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.





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 3: Independence Day Observed
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






Upcoming Events


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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...