Category: South Dakota — this specific category here on WikiIndex contains a list of articles (and any sub-categories) of wiki sites about the US state of South Dakota within the United States of America (USA). It may also include people, places, geography, history, language(s), and / or any other pertinent information. The US postal abbreviation for South Dakota is SD, and its ISO 3166-2 code is US–SD. Its capital city is Pierre, though its largest city is Sioux Falls.