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.

Hill County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 16,309. Its county seat is Havre. It lies along the United States border with Canada, abutting Alberta and Saskatchewan.