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is a town in Guilford, Liberty and Washington townships, Hendricks County, Indiana, United States. The population was 18,396 at the 2000 census. Its 2005 population, according to the Indiana demographic annual update, was 23,532. Plainfield is home to Metropolis, the largest mall on the west side of Indianapolis. The Plainfield School System is the only school system in the state to have all of its public schools receive 4 stars for two years in a row. Extensive renovation of State Road 267 has recently been completed in preparation for a 100+ million dollar High School.
According to the United States Census Bureau, the town has a total area of 18.0 square miles (46.7 km²), of which, 18.0 square miles (46.6 km²) of it is land and 0.1 square miles (0.1 km²) of it (0.28%) is water.