Long Branch is a beach side city in Monmouth County, New Jersey, United States. As of the 2010 United States Census, the city's population was 30,719, reflecting a decline of 621 (-2.0%) from the 31,340 counted in the 2000 Census, which had in turn increased by 2,682 (+9.4%) from the 28,658 counted in the 1990 Census. Long Branch was formed on April 11, 1867, as the Long Branch Commission, from portions of Ocean Township.