Sussex is a borough in Sussex County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 2,130, reflecting a decline of 15 from the 2,145 counted in the 2000 Census, which had in turn declined by 56 from the 2,201 counted in the 1990 Census.Sussex was incorporated as a borough by an act of the New Jersey Legislature on October 14, 1891, as Deckertown, from portions of Wantage Township. The borough's original... Show more

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