St. Mary's County Map
The County of St. Mary's is located in the State of Maryland. Find directions to St. Mary's County, browse local businesses, landmarks, get current traffic estimates, road conditions, and more. According to the 2020 US Census the St. Mary's County population is estimated at 114,687 people. The St. Mary's County time zone is Eastern Daylight Time which is 5 hours behind Coordinated Universal Time (UTC).
Nearby counties include Calvert County, Charles County, Dorchester County, Somerset County, Northumberland County, Westmoreland County.
Top cities include Leonardtown, Charlotte Hall, Lexington Park, Tall Timbers, Mechanicsville