Key is an unincorporated community in Belmont County, in the U.S. state of Ohio.
A post office called Key was established in 1879, and remained in operation until 1933.
[1] Key was formerly called Bethel.
[2] In addition to the post office Bethel (Key) had a train station, schoolhouse, and church.
This Belmont County, Ohio state location article is a stub.