WHAT YOU NEED TO KNOW
Area code 512 serves the Austin metro in central Texas, covering cities including Austin, Round Rock, Cedar Park, and San Marcos. Established in 1947 as one of the original NANP codes, the area code covers approximately 2.3 million residents and is the primary local code for businesses and residents across the greater Austin region.
- Population: ~2.3 million in the metro
- Overlay: Overlay: 737 (introduced 2013)
- Dialing: 10-digit dialing required
- Source Type: Local geographic code
Geographic Coverage
Area code 512 spans a broad portion of central Texas centered on Travis County, which contains Austin, the state capital. The code also covers Williamson County (Round Rock, Georgetown, Cedar Park, Leander, Taylor), Hays County (Kyle, Buda, San Marcos), Bastrop County (Bastrop, Elgin), Caldwell County (Lockhart), Burnet County (Marble Falls), and portions of additional surrounding counties. Together these areas form the Austin-Round Rock-Georgetown metropolitan statistical area.
Population and Business Context
The 512 market encompasses one of the fastest-growing metro areas in the United States. Austin is home to major technology employers including Dell Technologies, Apple, Tesla, and Samsung, alongside a large state government sector anchored by the Texas State Capitol. The University of Texas at Austin adds a significant academic and startup presence. Smaller cities like San Marcos and Georgetown host regional universities, retail corridors, and light manufacturing operations.
Area Code History
Area code 512 was assigned in 1947 as part of the original North American Numbering Plan, making it one of the oldest area codes in the country. At that time, a single code served the entire state of Texas. As Texas population grew, the state was divided into additional codes. The 512 footprint shrank over successive splits, eventually settling on the Austin metro. In 2013, overlay code 737 was introduced to address numbering exhaustion without requiring geographic splits.
How to Dial
Because 512 shares its geographic territory with overlay code 737, all local calls within the 512 area require 10-digit dialing (area code plus seven-digit number). You do not need to dial a leading 1 for local calls, but you must include all 10 digits. Long-distance calls to numbers outside the 512 and 737 overlay zone follow standard 1-plus-10-digit format. This dialing rule has been in effect since the 737 overlay was activated.
Need a 512 Number for Your Austin Metro Business?
Businesses operating in Austin, Round Rock, San Marcos, and the surrounding 512 region can provision a local 512 tracking number through Convirza. A local area code builds caller recognition and ties your advertising directly to the market you serve. Convirza provisions trackable local numbers in any North American area code, including 512 and its overlay 737, with no hardware required. Every call through your 512 number is automatically scored, recorded, and source-attributed using dynamic number insertion (DNI), so you know exactly which campaign, keyword, or channel drove each inbound call. Calls can be routed to any team member, location, or call center in real time. You get a complete picture of call quality and marketing ROI without manual reporting.
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