Greencastle is a borough in Franklin County in south-central Pennsylvania, United States. The population was 4,251 at the 2020 census. Greencastle lies within the Cumberland Valley of Pennsylvania. The region known today as Greencastle was previously inhabited by the Indigenous people of the Six Nations tribes, who lived in and hunted game throughout Fr…Greencastle is a borough in Franklin County in south-central Pennsylvania, United States. The population was 4,251 at the 2020 census. Greencastle lies within the Cumberland Valley of Pennsylvania. The region known today as Greencastle was previously inhabited by the Indigenous people of the Six Nations tribes, who lived in and hunted game throughout Franklin County, Pennsylvania. The Shawnee and Seneca tribes were most prominent in the region.
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