Frederick -- U.S. County in Maryland Population (2000): 195277 Housing Units (2000): 73017 Land area (2000): 662.875088 sq. miles (1716.838523 sq. km) Water area (2000): 4.460272 sq. miles (11.552052 sq. km) Total area (2000): 667.335360 sq. miles (1728.390575 sq. km) Located within: Maryland (MD), FIPS 24 Location: 39.463730 N, 77.413925 W Headwords: Frederick Frederick, MD Frederick County Frederick County, MD