Marshalltown is an unincorporated community located within Mannington Township, in Salem County, New Jersey.[7] Before the abolition of slavery, these black-populated communities offered protection and aid to fugitive slaves, and "the likelihood that there was antebellum Underground Railroad activity is high".[5][6] The settlement once contained many houses and gardens, a school, stores, and two churches.[8] By 2010, only a school house, a church, and two cemeteries survived, and "isolation, theft, vandalism, and lack of historic preservation planning threaten the surviving cultural landscape of Marshalltown".It was added to the National Register of Historic Places on July 17, 2013, for its significance in architecture, ethnic heritage - Black, community development, landscape architecture, religion, and social history from 1834 to 1951.