Hackettstown is a New Jersey Transit station in Hackettstown, New Jersey. The station is located at the intersection of Valentine Street and Beatty Street and is the western terminus of the Morristown Line and the Montclair-Boonton Line, which both provide service to Hoboken Terminal or to Pennsylvania Station in Midtown Manhattan via Midtown Direct. Hackettstown station is the only active New Jersey Transit station in Warren County. The line from Hackettstown–Dover is diesel powered, requiring a transfer at Dover, Montclair State University or Newark Broad Street to an electrified train to New York Penn Station. Proposals exist of an extension of the Montclair-Boonton Line, including an extension to Washington and possibly Phillipsburg further along the Washington Secondary.

Hackettstown is a town in Warren County, in the U.S. state of New Jersey. It is perhaps best known as the home to the US headquarters of Mars, Inc.. As of the 2020 United States census, the town's population was 10,248, an increase of 524 (+5.4%) from the 2010 census count of 9,724, which in turn reflected a decline of 679 (−6.5%) from the 10,403 counted in the 2000 census.