Liberty County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 1,959. Its county seat is Chester. The decision to separate the future Liberty County area from the previous Hill and Chouteau counties was carried in a 1919 vote; the organization was authorized to commence in the following February.

Toole County is a county in the northern portion of the U.S. state of Montana. As of the 2020 census, the population was 4,971. Its county seat is Shelby. The county was established in 1914 from parts of Hill County and Teton County and was named after Joseph Toole, the first and fourth governor of Montana. Its northern boundary is the Canada–United States border south of Alberta.