Welcome to Calvert County ...Time Zone: Calvert County lies in the Eastern Time Zone (EST/EDT) and observes daylight saving time. The community of Prince Frederick is the Seat for Calvert County. Calvert County was founded in 1654. From the Census Estimates for 2019, <1> Calvert had a population of 92,525 people. This is an increase of 3.97% since the last Census (which gave a population of 88,988 people in 2010). At the time of the 2010 Census, Calvert represented 1.54% of the total population of Maryland. Websites of Interest ...
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