Poplar is a city in Roosevelt County, Montana, United States.

[3] It is the tribal headquarters for the Fort Peck Indian Reservation, though Wolf Point is the most populous.

[4] The reservation is home to both the Assiniboine and Sioux Tribes, two distinct American Indian Nations.

Poplar hosts a Native American Pow Wow called Poplar Indian Days every year, the first weekend in September that is well attended by locals and traveling dancers with prizes for dancers and drummers.

[6] According to the United States Census Bureau, the city has a total area of 0.28 square miles (0.73 km2), all land.

Poplar is the seat for the Fort Peck Sioux and Assiniboine Tribes, including the tribal law enforcement agency, courthouse,[12] and the Fort Peck Reservation correctional facility.

[13] The Bureau of Indian Affairs maintains an agency office in Poplar.

[16] Poplar is home to the main campus of Fort Peck Community College.

The Poplar Municipal Airport provides for light aircraft and general aviation on a single 4,400 feet (1,341 m) runway.

The IHS contracts with Northeast Montana Health Services (NEMHS) which operates Poplar Community Hospital, a critical access hospital with an emergency room, swingbed unit, pharmacy, 22-bed inpatient facility for inpatient services, as well as the Riverside Clinic, and hospital and clinic in Wolf Point, Montana.