Shannon -- U.S. County in South Dakota Population (2000): 12466 Housing Units (2000): 3123 Land area (2000): 2093.881613 sq. miles (5423.128251 sq. km) Water area (2000): 2.766219 sq. miles (7.164474 sq. km) Total area (2000): 2096.647832 sq. miles (5430.292725 sq. km) Located within: South Dakota (SD), FIPS 46 Location: 43.279002 N, 102.485904 W Headwords: Shannon Shannon, SD Shannon County Shannon County, SD