Salem County is located in the U.S. state of New Jersey. Its county seat is Salem. This county is considered part of the Delaware Valley area. Adjacent counties are Gloucester and Cumberland in New Jersey and New Castle in Delaware. Salem County has a total area of approximately 373 square miles of which 91% is land and 9% water. As of the 2000 census, there were 64,285 people, 24,295 households, and 17,370 families residing in Salem County, NJ.