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512 and 737 are North American telephone area codes serving Central Texas, currently for telephones in and near Austin. Counties currently served by these area codes include Bastrop, Burnet, Caldwell, Hays, Travis, Milam and Williamson. 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.rea 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.
Ten digit dialing (area code + seven digit number) is necessary in the 512/737 overlay because two different homes in the same geographic area can have the same seven digit phone number but each would have a different area code.Counties in Texas within area code 737 include:Bastrop County, Burnet County, Caldwell County, Fayette County, Gonzales County, Guadalupe County, Hays County, Lampasas County, Llano County, Milam County, Travis County, and Williamson County.en digit dialing (area code + seven digit number) is necessary in the 512/737 overlay because two different homes in the same geographic area can have the same seven digit phone number but each would have a different area code. Counties in Texas within area code 737 include: