Resident Population in Glacier County, MT was 13.60900 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Glacier County, MT reached a record high of 13.79700 in January of 2018 and a record low of 10.10000 in January of 1977. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Glacier County, MT - last updated from the United States Federal Reserve on May of 2024.