Austin, TX Area Codes

Area codes serving Austin

Austin sits in Texas, part of the South region and the Central Time zone. Its numbers are spread across an overlay of 2 codes that all cover the same ground: 512, 737.

The original code is 512 (in service since 1947). As the area ran low on numbers, regulators added overlay codes on top instead of splitting the city, so longtime residents kept their numbers while new lines received a newer code.

Code	Area served	In service
512	Austin and surrounding Central Texas counties, including Round Rock and San Marcos	January 1, 1947
737	Austin and surrounding Central Texas counties, including Round Rock and San Marcos	July 1, 2013

Nearby cities sharing these area codes

• Round Rock
• Cedar Park
• Georgetown
• Pflugerville
• San Marcos
• Leander
• Kyle
• Hutto
• Buda
• Lakeway
• Bastrop
• Lockhart
• Burnet

How to pick an area code for a new number

When you activate a new line in Austin, the carrier assigns whichever code has numbers available — you usually can't choose. If a specific code matters to you (for example the prestige of 512), ask the carrier whether any blocks remain, or request a number transfer. All codes here dial identically and cost the same.

Dialing in Austin

Because Austin is an overlay area, 10-digit dialing is mandatory: always dial the area code plus the seven-digit number, even for a neighbor. See 10-digit dialing and overlay area codes for the background. For every code in Texas, visit the Texas area codes page.