The tribes in bold indicate the original Seven Council Fires or Oceti Sakowin, also known as the Great Sioux Nation.

Siouan language family

Dakota dialect - [also known as Santee or Isanti Division]
  1) Mdewakanton (mystery lake village)
  2) Wahpekute (leaf shooters)
  3) Sisseton (marsh village)
  4) Wahpeton (leaf village)

Nakota dialect - [also known as Yankton Division]
  5) Yankton (border village)
  6) Yanktonai (little border village)

Lakota dialect - [also known as Teton Division]
  7) Teton (prairie village) with 7 sub-divisions:
    * Sicangu (burnt thighs)
    * Itazipco (without bows)
    * Sihasapa (black feet)
    * Mnicoujou (planters by the water)
    * Oohenumpa (two boilings)
    * Oglala (scatter at one's self)
    * Hunkpapa (head of camp circle)



The modern political divisions are as follows:

Cheyenne River Sioux Tribe
Teton Lakota (Sihasapa, Mnicoujou, Itazipco, and Oohenumpa)
Primary location: Cheyenne River Indian Reservation, north-central South Dakota
Website: http://www.sioux.org/

Oglala Sioux Tribe
Teton Lakota (Oglala)
Primary location: Pine Ridge Reservation, south-western South Dakota
Website: http://www.lakotamall.com/oglalasiouxtribe/
Website: http://home.comcast.net/~zebrec/index.html

Rosebud Sioux Tribe
Teton Lakota (Sicangu)
Primary location: Rosebud Indian Reservation, south-central South Dakota
Website: http://www.rosebudsiouxtribe-nsn.gov/

Lower Brulé Sioux Tribe
Teton Lakota (Sicangu)
Primary location: Lower Brulé Indian Reservation, central South Dakota
Website: http://www.lbst.org/

Yankton Sioux Tribe
Yankton Nakota (Yankton)
Primary location: Yankton Sioux Indian Reservation, south-eastern South Dakota
Website: http://www.yanktonsioux.com/

Crow Creek Sioux Tribe
Santee Dakota (Mdewakanton)
Yankton Nakota (Yankton)
Primariy location: Crow Creek Indian Reservation, central South Dakota
Website:

Sisseton-Wahpeton Sioux Tribe
Santee Dakota (Sisseton, Wahpeton)
Primary location: Sisseton-Wahpeton Indian Reservation, north-eastern South Dakota
Website: http://www.earthskyweb.com/sota.html

Flandreau Santee Sioux Tribe
Santee Dakota (Mdewakanton, Wahpekute)
Primary location: Flandreau Santee Sioux Reservation, eastern South Dakota
Website: http://www.fsst.org/

Standing Rock Sioux Tribe
Teton Lakota (Hunkpapa, Sihasapa)
Yankton Dakota (Yanktonai)
Primary location: Standing Rock Indian Reservation, south-central North Dakota/north-central South Dakota
Website: http://www.standingrock.org/

Spirit Lake Sioux Tribe
Santee Dakota (Sisseton, Wahpeton)
Primary location: Spirit Lake Tribe Indian Reservation, east-central North Dakota
Website: http://www.spiritlakenation.com/

Santee Sioux Tribe of Nebraska
Santee Dakota
Primary location: Santee Dakota Indian Reservation, north-eastern Nebraska
Website: http://www.santeedakota.org/

Upper Sioux Tribe
Santee Dakota
Primary location: Granite Falls, Minnesota
Website: http://www.uppersiouxcommunity-nsn.gov/

Lower Sioux Community
Santee Dakota (Mdewakanton)
Primary location: Morton, Minnesota
Website: http://www.lowersioux.com/

Shakopee Mdewakanton Sioux Community
Santee Dakota (Mdewakanton)
Primary location: Prior Lake, Minnesota
Website: http://www.ccsmdc.org/

Prairie Island Sioux Community
Santee Dakota (Mdewakanton)
Primary location: Welsh, Prairie Island, Minnesota
Website: http://www.prairieisland.org/

Mendota Mdewakanton Dakota Community
Santee Dakota (Mdewakanton)
Primary location: Mendota, Minnesota
Website: http://www.mendotadakota.org/

Fort Peck Tribes
Assiniboine and Sioux (Yanktonai, Mdewakanton, Wahpekute, Sisseton, Wahpeton)
Primary location: Fort Peck Indian Reservation, North-East Montana
Website: http://www.fortpecktribes.org/