is a borough on the northwestern edge of Union County, New Jersey, United States. It is located on the Passaic River, which forms the county boundary with Morris County. As of the United States 2000 Census, the population was 11,907.
New Providence is bordered to the north by Chatham Township, across the Passaic River. New Providence maintains its waste treatment plant on that river. Berkeley Heights lies to the southwest and south, and Summit to the east. Much of the unincorporated area of Murray Hill lies in New Providence, with the remainder in Berkeley Heights.
The borough lies on the western slope of Second Watchung Mountain. There are several creekbeds carved into the landscape, most of which are forks and branches of Salt Brook. These creeks join together near the center of town then flow into the Passaic River. Over nine percent of New Providence's land area is permanently protected, publicly owned parkland. Most of this land is wooded floodplain adjacent to the Passaic. Union County owns much of the riverfront parkland and New Providence owns the remainder. There are several Borough-owned parks that bracket Salt Brook, including Veterans Memorial Park on South Street, Lyons Park on Livingston Avenue, and Clearwater Park near the end of Central Avenue.
According to the United States Census Bureau, the New Providence has a total area of 3.7 square miles (9.5 km