Newton, officially the Town of Newton, is an incorporated municipality located in Sussex County, New Jersey, United States. It is situated approximately 60 miles by road northwest of New York City. It is one of fifteen municipalities in the state organized as a town, and the municipal government operates under a council-manager structure provided by the Faulkner Act, or Optional Municipal Charter Law. As the location of the county's administrative offices and court system, Newton is the county seat of Sussex County.Newton was incorporated by an act of the New Jersey Legislature on April 11, 1864, from portions of Newton Township, which was also partitioned to create Andover Township and Hampton Township, and was then dissolved. Additional land was acquired from Andover Township in 1869 and 1927, and from Fredon Township in 1920.