is a Borough in Sussex County, New Jersey, United States. As of the United States 2000 Census, the borough population was 2,145.
Sussex was incorporated as a borough by an Act of the New Jersey Legislature on October 14, 1891 as Deckertown, from portions of Wantage. The borough was renamed as Sussex on March 2, 1902.
Sussex Borough is currently planning a consolidation study with surrounding Wantage Township. Nearby Montague Township may also take part in the study.
Sussex is located at (41.209485, -74.606878). It is located approximately 400 feet to 450 feet above sea level.
According to the United States Census Bureau, the borough has a total area of 0.6 square mile (1.6 km
Hydrologically. Sussex borough is in the watershed of the Wallkill River, (which flows north, and empties into the Rondout Creek, which flows into the Hudson River near Kingston, New York), and its tributary the Glen Brook, which near Sussex forms a small body of water called Clove Lake, part of which is within the borough.