600 (Golla 2007), decreasing. Ethnic population: 35,000–37,000 (1999 Chickasaw Nation).
Mainly south central Oklahoma, from Byng or Happyland (near Ada) north, Davis or Ardmore west, to Fillmore and Wapanucka east. Some in Los Angeles, California.
Choctaw [cho] find Chickasaw unintelligible.
Shifting to English [eng]. Not learned by children. Speakers 50 years and older.