Resident Population in Hill County, MT was 16.27600 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Hill County, MT reached a record high of 18.44000 in January of 1982 and a record low of 16.06800 in January of 2022. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Hill County, MT - last updated from the United States Federal Reserve on May of 2024.