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 such as Bastrop, Burnet, Caldwell, Hays, Travis, Milam, and Williamson, enveloping a significant portion of Central Texas (source). Other notable cities within this area code include San Marcos, Round Rock, Georgetown, Cedar Park, and Leander (source).

Area code 512 has a single overlay area code, 737, which serves the same geographic region (source). The area code 512 is surrounded by other Texas area codes such as 210 for San Antonio, 254 to the north, 979 to the southeast, 830 to the southwest, and 325 to the northwest (source).