Greencastle is a city in Greencastle Township, Putnam County, Indiana, United States. It was founded in 1821 by Scots-Irish American Ephraim Dukes on a land grant. He named the settlement for his hometown of Greencastle, Pennsylvania. Greencastle was a village or town operating under authority of the Putnam County commissioners until March 9, 1849, when it became a town by special act of the local legislature. Greencastle, Indiana officially became a city after an election held on July 8, 1861. The first mayor of Greencastle was E. R. Kercheval, a member (during his lifetime) of the Freemason Temple Lodge #47. The city became the county seat of Putnam County. The population was 10,326 at the 2010 census. It is located near Interstate 70 between Terre Haute and Indianapolis in the west-central portion of the state.
Greencastle's public schools are operated by the Greencastle Community School Corporation. The Greencastle School Corporation consists of one Central Office; one High School, Greencastle High School, which hosts grades 9th through 12th; one Middle School, Greencastle Middle School, which hosts grades 6th through 8th; one Intermediate School, Tzouanakis Intermediate School, which hosts grades 3rd through 5th and two Primary Schools, Martha J. Ridpath Primary School (also known as Ridpath Primary) and Deer Meadow Primary School which each host kindergarten through 2nd grade.