Custer County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 11,867. Its county seat is Miles City. The county was established on June 2, 1865 as one of the nine original counties of the Territory of Montana named Big Horn County, and was renamed on February 16, 1877 in honor of Lieutenant Colonel George Armstrong Custer.
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Coordinates 46°24'30.698" N -105°50'27.532" E
