Plainville is a town in Norfolk County, Massachusetts, United States. The population at the 2010 census was 8,264. Plainville is part of the Providence metropolitan area.
According to the United States Census Bureau, the town has a total area of 11.6 square miles (30 km2), of which 11.1 square miles (29 km2) is land and 0.5 square miles (1.3 km2) (4.24%) is water. Plainville borders the towns of Wrentham, Foxboro, Mansfield, North Attleboro and Cumberland, Rhode Island. Children and teens living in Plainville attend the A.W. Jackson Elementary School for Kindergarten-3rd grade, then the B.H. Wood School for grades 4-6. Children then attend King Philip Middle School and King Philip Regional High School. Other high school options include the Foxborough Regional Charter School, Tri-County Regional Vocational Technical High School, and Bishop Feehan High School, all in neighboring towns.
As of the census of 2000, there were 7,683 people, 3,009 households, and 2,040 families residing in the town. The population density was 694.6 inhabitants per square mile (268.2/km≤). There were 3,111 housing units at an average density of 281.3 per square mile (108.6/km≤).