Plumsted Township is a township in Ocean County, New Jersey, United States. As of the 2010 United States Census, the township's population was 8,421, reflecting an increase of 1,146 from the 7,275 counted in the 2000 Census, which had in turn increased by 1,270 from the 6,005 counted in the 1990 Census. The 2010 population was the highest recorded in any decennial census.
Plumsted Township was incorporated as a township by an act of the New Jersey Legislature on March 11, 1845, from portions of Jackson Township, while the area was still part of Monmouth County. Plumsted Township became part of the newly created Ocean County on February 15, 1850. The township was named for Clement Plumstead, an English Quaker who bought a large parcel of land, but never set foot in the area.
At one time, Plumsted included five separate Superfund sites, four of which have been removed from the National Priorities List, the most of any township in New Jersey.