The Tai Viet script is used by three Tai languages spoken primarily in northwestern Vietnam, northern Laos, and central Thailand—Tai Dam (also Black Tai or Tai Noir), Tai Dón (White Tai or Tai Blanc), and Thai Song (Lao Song or Lao Song Dam). The Thai Song people of Thailand are geographically removed from, but linguistically related to the Tai people of Vietnam and Laos.
There are also Tai speaking populations in Australia, China, France, and the United States.