Area codes 512 and 737

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Area codes 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. Area code 512 was one of the original area codes established in October 1947. At that 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. Despite the presence of San Antonio and Austin—the state's third- and fourth-largest cities, respectively, for most of the second half of the 20th century—this configuration remained in place for 45 years. In 1992, the western part of its territory, including San Antonio and the Rio Grande Valley, became area code 210, making 512 the last of Texas' original four area codes to be split. Typically, the largest city in an existing area code keeps the original code, which in this case would...

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