Greencastle is an unincorporated community in Fairfield County, in the U.S. state of Ohio.
[1] Greencastle was laid out in 1810.
[2] A post office called Greencastle was established in 1845, and remained in operation until 1902.
[3] George Washington Glick, 9th Governor of Kansas
This Fairfield County, Ohio state location article is a stub.