The Sussex Railroad was a short-line railroad in northwestern New Jersey. It replaced its predecessor, the Sussex Mine Railroad, in 1853 and operated under the Sussex Railroad Company until 1945 when it was fully merged into the Delaware, Lackawanna and Western Railroad (DL&W) system. The Sussex Railroad was important in the economic development of Sussex County as it supplied a route for early local industries, such as dairy farms and ore mines, to export their products. It was the last independently operated New Jersey railroad to be incorporated into the DL&W system. The last train travelled on the Sussex Railroad tracks on October 2, 1966. The tracks were removed soon after and the right-of-way was transformed into a rail trail known as the Sussex Branch Trail.

Sussex County is the northernmost county in the U.S. state of New Jersey. Its county seat is Newton. It is part of the New York metropolitan area and is part of New Jersey's Skylands Region. As of the 2020 census, the county was the state's 17th-most-populous county, with a population of 144,221, a decrease of 5,044 (−3.4%) from the 2010 census count of 149,265, which in turn reflected an increase of 5,099 (+3.5%) over the 144,166 persons at the 2000 census. Based on 2020 census data, Vernon Township was the county's largest in both population and area, with a population of 22,358 and covering an area of 70.59 square miles (182.8 km2). The county is part of the North Jersey region of the state.