Here you go. This should tell you most of what you need to know.
Condensed from Wiki:
Sioux comprise three major divisions based on dialect and subculture:
Santee or Eastern Dakota residing in the extreme east of the Dakotas, Minnesota, and northern Iowa,
Yankton or Western Dakota residing in the Minnesota River area, they are considered to be the middle Sioux
Teton or Tetonwan and are often referred to as the Lakota the westernmost Sioux
The seven branches or "sub-tribes" of the Lakota are Sicangu, Oglala, Itazipco, Hunkpapa, Miniconjou, Sihasapa, and Ooinunpa.
Today, the Sioux maintain many separate tribal governments scattered across several reservations, communities, and reserves in the Dakotas, Minnesota, Nebraska, and also in Manitoba and southern Saskatchewan in Canada.
Map http://en.wikipedia.org/wiki/File:Sioux01.png
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