Dorchester -- U.S. County in Maryland Population (2000): 30674 Housing Units (2000): 14681 Land area (2000): 557.540229 sq. miles (1444.022503 sq. km) Water area (2000): 425.375616 sq. miles (1101.717742 sq. km) Total area (2000): 982.915845 sq. miles (2545.740245 sq. km) Located within: Maryland (MD), FIPS 24 Location: 38.546629 N, 75.983875 W Headwords: Dorchester Dorchester, MD Dorchester County Dorchester County, MD