Mammoth, MT

Mammoth is an unincorporated community and census-designated place in Madison County, Montana, United States. The 2020 census counted 4 residents. Mammoth is in the northern part of the county, in the valley of the South Boulder River within the northern end of the Tobacco Root Mountains. Via the South Boulder River, it is part of the Jefferson River watershed, one of the headwaters of the Missouri River. That mix gives Mammoth a clear local shape within Montana, with older layers still visible in current places. The local scoop is a place whose streets, landmarks, and institutions keep its earlier story close to the present.