Geographic Regions and Area Codes

Area code 512 predominantly serves Central Texas, with Austin being the largest city under its coverage. This area includes several counties—Bastrop, Burnet, Caldwell, Hays, Travis, Milam, and Williamson—enveloping a significant portion of Central Texas. Other notable cities include San Marcos, Round Rock, Georgetown, Cedar Park, and Leander.

Area code 512 has a single overlay, 737, which serves the same geographic region. Implemented in 2013, the 737 overlay requires 10-digit dialing for all local calls, with the combined 512/737 area code complex projected to exhaust by Q4 2034. Surrounding area codes include: