<P> 512 and 737 are North American telephone area codes serving Austin, Texas, and its suburbs . Counties currently served by these area codes include Bastrop, Burnet, Caldwell, Hays, Travis, Milam and Williamson . </P> <P> Area code 512 was one of the original area codes established in October 1947 . At the time, it covered most of the south - central portion of Texas, from the Gulf of Mexico to the Mexican border . Besides Austin, it included San Antonio, Corpus Christi, Brownsville, Harlingen, and McAllen . </P>

What is the area code for austin texas