Welcome to Saint Mary's County ...Time Zone: Saint Mary's County lies in the Eastern Time Zone (EST/EDT) and observes daylight saving time. The community of Leonardtown is the Seat for Saint Mary's County. Saint Mary's County was founded in 1637. From the Census Estimates for 2019, <1> Saint Mary's had a population of 113,510 people. This is an increase of 7.33% since the last Census (which gave a population of 105,761 people in 2010). At the time of the 2010 Census, Saint Mary's represented 1.83% of the total population of Maryland. Websites of Interest ...
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