Poplar is a city in Roosevelt County, Montana, United States. The population was 758 at the 2020 census. It is the tribal headquarters f…Poplar is a city in Roosevelt County, Montana, United States. The population was 758 at the 2020 census. It is the tribal headquarters for the Fort Peck Indian Reservation, though Wolf Point is the most populous. The reservation is home to both the Assiniboine and Sioux Tribes, two distinct American Indian Nations.
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