Raritan Township is a township in Hunterdon County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 23,447, an increase of 1,262 (+5.7%) from the 2010 census count of 22,185, which in turn reflected an increase of 2,376 (+12.0%) from the 19,809 counted in the 2000 census. The township is located within the heart of the Amwell Valley and Raritan Valley regions, as the South Branch of the Raritan River flows through the center of the township. The northwestern portion of the township is located on the Hunterdon Plateau.

Hunterdon County is a county located in the western section of the U.S. state of New Jersey. At the 2020 census, the county was the state's 18th-most populous county, with a population of 128,947, its highest decennial count ever and an increase of 598 (+0.5%) from the 2010 census count of 128,349, which in turn reflected an increase of 6,360 (5.2%) from the 121,989 counted in the 2000 census. Its county seat is Flemington. The county is part of the Central Jersey region of the state.