Unemployment Rate in St. Mary's County, MD was 2.70% in January of 2024, according to the United States Federal Reserve. Historically, Unemployment Rate in St. Mary's County, MD reached a record high of 6.70 in January of 2010 and a record low of 2.00 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Unemployment Rate in St. Mary's County, MD - last updated from the United States Federal Reserve on April of 2026.