what county is hamburg nj in
Hamburg, New Jersey. Hamburg is a borough in Sussex County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 3,277, reflecting an increase of 172 (+5.5%) from the 3,105 counted in the 2000 Census, which had in turn increased by 539 (+21.0%) from the 2,566 counted in the 1990 Census.