Thanks for all of your help in finding where Minco is located. <to share with the group> Minco, In Western Grady County. Post office established June 20, 1890. The name is an Indian word meaning "Chief." this is taken from Oklahoma Place names by George Shirk There is a town called Minco in northern Grady County, Oklahoma not far from the Canadian River. At least it was there when this map was published in 1935. Ann Waite-Tepe crtepe@email.msn.com Reaching: Aldridge, Darter, Core, Holden, Ireland, Peterson, Workman, Sawyers,Taylor.