Greencastle is a city in Greencastle Township, Putnam County, Indiana, United States, and the county seat of Putnam County. It was founded in 1821 by 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,... Show more

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