Smithville is an unincorporated community and census-designated place (CDP) located within Galloway Township, in Atlantic County, in the U.S. state of New Jersey, that was established as part of the 2010 United States Census. Smithville is located 15 miles (24 km) north of and inland from Atlantic City. As of the 2010 Census, the CDP's population was 7,242.

Galloway Township is a township in Atlantic County, in the U.S. state of New Jersey, and a growing edge city to neighboring Atlantic City. At 114.49 square miles (296.5 km2) of total area of land and water, Galloway Township is the largest municipality in the state. As of the 2020 United States census, the township's population was 37,813, its highest decennial count ever and an increase of 464 (+1.2%) from the 2010 census count of 37,349, which in turn reflected an increase of 6,140 (+19.7%) from the 31,209 counted in the 2000 census.