New Providence is a borough on the northwestern edge of Union County, in the U.S. state of New Jersey. It is located on the Passaic River, which forms the county boundary with Morris County bordering Chatham Township. As of the 2020 United States census, the borough's population was 13,650, an increase of 1,479 (+12.2%) from the 2010 census count of 12,171, which in turn reflected increase of 264 (+2.2%) from the 11,907 counted in the 2000 census.

Union County is a county in the northern part of the U.S. state of New Jersey. As of the 2020 United States census, the county was the state's seventh-most-populous county with a population of 575,345, its highest decennial count ever and an increase of 38,846 (+7.2%) from the 2010 census count of 536,499. Its county seat is Elizabeth, which is also the most populous municipality in the county, with a 2020 census population of 137,298, and the largest by area, covering 13.46 square miles (34.9 km2). The county serves as a transition point between the Central Jersey and North Jersey regions of the state.