The 5 largest ethnic groups in St. Mary's County, MD are White (Non-Hispanic) (71%), Black or African American (Non-Hispanic) (14.6%), Two+ (Non-Hispanic) (5.55%), Two+ (Hispanic) (2.71%), and Asian (Non-Hispanic) (2.54%).
None of the households in St. Mary's County, MD reported speaking a non-English language at home as their primary shared language. This does not consider the potential multi-lingual nature of households, but only the primary self-reported language spoken by all members of the household.
98.2% of the residents in St. Mary's County, MD are U.S. citizens.
Most people in St. Mary's County, MD drove alone to work, and the average commute time was 30.4 minutes. The average car ownership in St. Mary's County, MD was 2 cars per household.
St. Mary's County, MD borders Calvert County, MD, Charles County, MD, Dorchester County, MD, Somerset County, MD, Northumberland County, VA, and Westmoreland County, VA.