512 area code
Austin area, Central Time.Area code 512 covers Austin, Georgetown, San Marcos and 32 more places in Texas, on Central Time. 737 covers the same area.
Right now in Austin
Central Time (CST, UTC-6; CDT, UTC-5 in summer)
Calling hours: Mon to Sat, 9 AM to 9 PM · Sun, noon to 9 PM (Texas law)
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Where 512 numbers come from
Numbers are issued by rate center, a billing area named for its main town. 512 has 35. Each one's share is how many 512 numbers start there. Its biggest metro area is Austin-Round Rock-San Marcos, TX.
- Austin75%
- Georgetown4%
- San Marcos3%
- Bastrop2%
Also: Leander, Lockhart, Burnet, Taylor, Kyle, Lampasas, Rockdale, Buda, Wimberley, Elgin, Dripping Springs, Smithville + 19 more
Share of exchanges (blocks of 10,000 numbers). Source: NANPA rate center and exchange reports, November 10, 2026
When can you call a 512 number?
Sales calls to homes and cell phones have legal hours, set by Texas law. Hold every 512 number to them, since you can't tell a work line from a personal cell.
What applies to 512Mon to Sat, 9 AM to 9 PM · Sun, noon to 9 PM
- Federal (TCPA and FTC rule)Every day, 8 AM to 9 PMCalls to residential and mobile numbers. Most calls to businesses are exempt from the FTC's rule.47 CFR 64.1200(c)(1); 16 CFR 310.4(c) (opens in a new tab)
- Texas lawMon to Sat, 9 AM to 9 PM · Sun, noon to 9 PMCalls to residences.Tex. Bus. & Com. Code 301.051(b)(2) (opens in a new tab)
Local time comes from the area code, not from where the person is today. Mobiles keep their number when they move. Calling hours here are a guide, not legal advice. Every state's calling hours, with sources
512 and 737
512 is one of the original area codes from 1947, and 210 and 361 were later split off from it. 512 and 737 cover the same area, so new numbers can get either code and neighbors can have different area codes. 512 holds 71% of the area's exchanges; 737 holds the rest. Local calls take all 10 digits.
- 1947512 starts
- 1992210 split off
- 1999361 split off
- 2013737 overlay
Source: NANPA area code database
Calling a list of 512 numbers?
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512 area code FAQ
What area code is 512?
512 is a Texas area code for Austin, Georgetown, San Marcos, Bastrop and 31 more places.
What time zone is the 512 area code in?
Central Time (CST, UTC-6; CDT, UTC-5 in summer).
Is 737 the same as 512?
Same area, different code. 512 and 737 cover the same area (an overlay), so new numbers can get any of them and local calls take all 10 digits.
What are the calling hours for 512 numbers?
Mon to Sat, 9 AM to 9 PM · Sun, noon to 9 PM, local time, under Texas law.
When did the 512 area code start?
In 1947: it's one of the original area codes.
Calling 512 numbers? Reach more of them.
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