Union Beach is a borough in Monmouth County , New Jersey , United States. As of the 2010 United States Census , the borough's population was 6,245, reflecting a decline of 404 (-6.1%) from the 6,649 counted in the 2000 Census , which had in turn increased by 493 (+8.0%) from the 6,156 counted in the 1990 Census .
Union Beach was formed as a borough by an act of the New Jersey Legislature on March 16, 1925, from portions of Raritan Township (now Hazlet), based on the results of a referendum held on April 16, 1925. 
The borough is part of the Bayshore Regional Strategic Plan , an effort by nine municipalities in northern Monmouth County to reinvigorate the area's economy by emphasizing the traditional downtowns, dense residential neighborhoods, maritime history, and the natural beauty of the Raritan Bayshore coastline.
According to the United States Census Bureau , the borough had a total area of 1.889 square miles, including 1.804 square miles of land and 0.085 square miles of water (4.52%).
A monument to the victims of the September 11, 2001 terrorist attacks , constructed of black stone and dedicated in June 2002, is positioned to allow visitors to see past the memorial towards the location where the World Trade Center towers were visible from the borough.