Siouan languages
Siouan languages can be grouped into the Western Siouan languages and Catawban languages. The Western Siouan languages can be divided into Missouri River languages (such as Crow and Hidatsa), Mandan, Mississippi River languages (such as Dakotan, Chiwere-Winnebago, and Dhegihan languages), and Ohio Valley Siouan branches. The Catawban languages consist only of Catawban and Woccon.
Languages of the United States
Dakota is a Siouan language with 18,000 speakers in the US alone (22,000 including speakers in Canada), not counting 6,000 speakers of the closely related Lakota. Most speakers live in the states of North Dakota and South Dakota. Other Siouan languages include the closely related Winnebago, and the more distant Crow, among others.