Unemployment Rate in Carter County, MT was 2.40% in December of 2025, according to the United States Federal Reserve. Historically, Unemployment Rate in Carter County, MT reached a record high of 5.60 in March of 2002 and a record low of 0.90 in December of 1991. Trading Economics provides the current actual value, an historical data chart and related indicators for Unemployment Rate in Carter County, MT - last updated from the United States Federal Reserve on April of 2026.