Grimes is an unincorporated community in Roger Mills County, Oklahoma, United States. Grimes is located in the southern part of the county, 1…Grimes is an unincorporated community in Roger Mills County, Oklahoma, United States. Grimes is located in the southern part of the county, 11.4 miles south-southwest of Cheyenne. The Grimes post office opened on March 1, 1901 with John Gernade Lancaster as first Postmaster, and closed on November 26, 1971. Benjamin C. Olson was the last postmaster in Grimes. He then became the postmaster in nearby Sweetwater, Oklahoma. The community was named for acting Oklahoma territorial governor William C. Grimes.
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