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is a census-designated place and unincorporated area located within Roxbury Township, in Morris County, New Jersey. As of the United States 2000 Census, the CDP population was 12,569.
The name of Succasunna comes from the Lenni-Lenape Native American word for "Black Rock", most likely due to the rich iron-ore deposits in the area. The community was established circa 1740.
The Hercules Powder Co. in Kenvil has had explosions in 1934, killing 6 people; in 1940, killing 51 people; and in 1989, shattering windows across town.
Succasunna is the site of the world's first electronic switching public telephone exchange. Western Electric Model ESS-1 Serial Number 1 New Jersey Bell Telephone 584 exchange went live 30 May 1965. A commemorative plaque on the wall of the central office building notes this historic event.
U.S. Route 46 and Route 10 pass through the area. The Morristown and Erie Railway runs rail freight service through the area 2-5 times per week on its High Bridge Branch.