Serving employees of Burlington Northern, residents of Hill, Liberty, Blaine, and Chouteau county.

Serving people who live or work in Yellowstone, Big Horn, or Carbon Counties, Montana.

Serving persons living in Missoula; employees of Hoerner-WaldorfCorporation of Montana who work in Missoula; and numerous small employee groups.

Serving persons who live or work in Cascade County; employees of the Mountain States Telephone and Telegraph Company who work in Great Falls District; and numerous small employee groups.

Serving employees of schools in Cascade, Pondera, Teton, Choteau, and Judith Basin Counties.

Serving persons residing in or working in the City of Helena.

Serves members in Yellowstone, Carbon, Stillwater, Sweet Grass, Wheatland, Golden Valley and Musselshell counties.

Membership is open to people who live and work in Lincoln County, Montana.

Serving employees of Montana Rail Link and Burlington Northern who work in or are supervised from Livingston; county, school and federal employees in Park County, Montana, and numerous employee groups.

Serving those who live or work in Lake, Missoula, and Ravalli counties.

Serving participating patrons of numerous cooperatives, and employees of several small employee groups.

Serving employees of the State of Montana in numerous counties; several small employee groups in Bozeman; members of the union Local D239.

Serving persons, organizations, partnerships, and corporations that reside or operate within fifty air miles of Whitefish or Lake County, Montana.

Serving employees of school districts and college employees in Yellowstone, Carbon, Musselshell, Stillwater, Rosebud, Sweetgrass, Treasure counties.