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Cyr is an unincorporated community and census-designated place (CDP) in Mineral County, Montana, United States. As of the 2020 census, it had a population of 63. It is in the southeastern part of the county, in the valley of the Clark Fork. Interstate 90 crosses the community, with partial access from Exit 70. Alberton is 6 miles (10 km) to the east (upriver), while Superior, the Mineral county seat, is 22 miles (35 km) to the northwest (downriver).