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In page Sussex County, New Jersey:

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Early industry and commerce chiefly centered on agriculture, milling, and iron mining. As iron deposits were exhausted, mining shifted toward zinc deposits near Franklin and Ogdensburg during the late 19th and early 20th centuries. The local economy expanded due to the introduction of railroads and shortly after the Civil War, the town centers hosted factories. However, the factories, railroads and mining declined by the late 1960s. Today, Sussex County features a mix of rural farmland, forests and suburban development. Because agriculture (chiefly dairy farming) has decreased and that the county hosts little industry, Sussex County is considered a "bedroom community" as most residents commute to neighboring counties (Bergen, Essex and Morris counties) or to New York City for work.