Sauk-Fox (Meskwaki), spoken by about 200 members of the Meskwaki Tribe in Iowa. It was the heritage language also of the historically separate Sauk tribe, whose descendants today are the Sac and Fox Tribe of central Oklahoma and the Nemaha Sauks on the Kansas-Nebraska border. The Meskwaki variety is also called “Fox”; it differs from Sauk in minor details of pronunciation, grammar, and vocabulary, but the variation within Meskwaki alone is almost as great. Kickapoo was originally part of the same dialect complex, but for historical and social reasons it is treated as a separate language.

"A handful of Sauk speakers (2000 I. Goddard)." Data for the number of native speakers comes from I. Goddard (2001). Data for the ethnic population is from the 2000 census.

200 (2001 I. Goddard). 200 Mesquakie in Iowa, more than 50 Sac and Fox in central Oklahoma, a few Nemaha Sauks on the Kansas-Nebraska border (Golla 2007). Ethnic population: 760 Fox (2013).

The number 1,100 reflects a combination of speakers of both Sauk-Fox and Kickapoo as the two are mutually intelligible. So although the two areas are distinct and separate, according to the definition used here if two spoken systems are mutually intelligible, they are considered the same language.

200 (2001 I. Goddard). 200 Mesquakie in Iowa, more than 50 Sac and Fox in central Oklahoma, a few Nemaha Sauks on the Kansas-Nebraska border (Golla 2007). Ethnic population: 760 Fox.