Keystone is an extinct hamlet in northeastern Clinton County, in the U.S. state of Missouri. [1]
A post office at Keystone Station of the Leavenworth branch of the Chicago, Rock Island, and Pacific Railroad [2] [3] was established in 1874 and closed in 1919. [4] A nearby settlement known as West Keystone existed as well. [5] The name of Keystone is survived by a lone county road.
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