Public libraries · Union County, New Jersey
Mountainside Borough public library locations
Library locations
- Mountainside Free Public Library central · Mountainside Free Public Library
- 1 Constitution Plaze, Mountainside 07092 · map
- (201) 233-0115
- 52 hours a week
Locations from the IMLS Public Libraries Survey FY2023 outlet file, placed inside municipal boundaries from the NJ Office of GIS. Municipality name and code: NJ DCA. Legislative districts: NJ Legislature, 2026-09-18.