Plainville is a city in Rooks County, Kansas, United States. As of the 2010 census, the city population was 1,903.
The area was first settled in 1877 by Hiram Keas. Plainville, previously known as Paradise Flats, was established in 1888, in Rooks County, Kansas. With the advent of the railway in the 1880s, Plainville became a bustling community on the prairie. Today agriculture, oil production, and Schult Homes Manufacturing (now out of busisness) was at the heart of the economy.
Plainville is located at 39°13′56″N 99°18′11″W / 39.23222°N 99.30306°W / 39.23222; -99.30306 (39.232102, -99.303166) at an elevation of 2,146 feet (654 m). It lies in the Smoky Hills region of the Great Plains on the north side of Paradise Creek, a tributary of the Saline River. Southwest of the city, the creek has been dammed to form a small reservoir, Plainville Township Lake. Plainville is approximately 9 miles (14 km) north of the Saline River and 13 miles (20 km) south of the South Fork Solomon River. Located in north-central Kansas at the intersection of U.S. Route 183 and K-18, Plainville is approximately 150 miles (242 km) northwest of Wichita and 253 miles (407 km) west of Kansas City.