Plains Township is a township in Luzerne County, Pennsylvania in the greater metropolitan area of the city of Wilkes-Barre. The population was 10,906 at the 2000 census. Plains Township is the location of Pennsylvania's first casino, Mohegan Sun at Pocono Downs. It is also the birthplace of Chicago White Sox hall of famer Ed Walsh.
According to the United States Census Bureau, the township has a total area of 13.6 square miles (35.1 km²), of which, 13.3 square miles (34.4 km²) of it is land and 0.3 square miles (0.8 km²) of it (2.14%) is water. It extends from the Susquehanna River in the northwest to the north slope of Wyoming Mountain in the southeast. Its villages include Hudson, Llewellyn Corners (also in Bear Creek Township,) Midvale, Plains, Plainsville, and Westminster.
Plains Township's numbered routes include Interstate 81, Route 115, Route 309, and Route 315. Interstate 476 crosses the eastern portion of Plains Township between the Wilkes-Barre and Wyoming Valley interchanges with 115 and 315, respectively. Main Street and River Street cross the populous NW portion of the township between Wilkes-Barre and Pittston. 309 follows the Cross Valley Expressway from the junction of 81 and 115 to the West Side communities and also has an interchange with River Street in the township.