a state of the western US: lies mostly in the Great Plains; the chief US producer of gold and beryl. Capital: Pierre. Pop: 764 309 (2003 est). Area: 196 723 sq km (75 955 sq miles)
Abbreviation: S. Dak. or (with zip code) SD
South Dakota in American English
Midwestern state of the NC U.S.: admitted, 1889; 75,885 sq mi (196,540 sq km); pop. 755,000; cap. Pierre