McMillan is an unincorporated community in Marshall County, Oklahoma, United States. McMillan is located south of U.S. Route 70 in the western part of the county, west of Madill.
A post office was established at McMillan, Indian Territory on March 28, 1892. It was named for Joseph E.A. McMillan, first postmaster.George H. Shirk. Oklahoma Place Names (Norman: University of Oklahoma Press, 1965), p. 133.
At the time of its founding, McMillan was located in Pickens County, Chickasaw Nation.Charles Goins, Historical Atlas of Oklahoma (Norman: University of Oklahoma Press, 2006), plate 105.
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