600 (Golla 2007), decreasing. Ethnic population: 35,000 (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.
None known. Choctaw [cho] find Chickasaw unintelligible.
Shifting to English [eng]. Not learned by children. Speakers 50 years and older.