Area, 43.0 sq. miles. Population, est., 14,593. Voting districts, 4. Principal industries, cement blocks, chemical products, assembly parts for manufacture of helicopters, automotive rubber strips, rubber laboratory stoppers, plastics and styrene, machine tools and accessories, concrete pipe, rubber molded parts, tools and dies, screen printed materials and electronic components.

The town of Plainfield includes four villages: Moosup, Plainfield, Central Village and Wauregan.