Mount Calvert, 16302 Mount Calvert Road, Upper Marlboro, Prince George's County, MD

Significance: Mount Calvert is an outstanding example of a Federal-style brick plantation house in Prince George's County. It is distinguished by its pent chimneys and its elaborate Federal-period interiors, among the finest in the county. Mount Calvert is the site of the first county seat of Prince George's County. On April 23, 1696, the appointed justices of the county court met at this site to formally bring the county into existence. It remained the county seat for twenty-five years until moved to Upper Marlboro, in 1721. The house, Mount Calvert, is all that remains to mark the site of the original county seat.
Survey number: HABS MD-176
Building/structure dates: 1796 Initial Construction
Building/structure dates: 1809 Subsequent Work