Texas · Central Time
737 Area Code
Area code 737 is in Texas, serving Austin and surrounding Central Texas counties, including Round Rock and San Marcos. It is in the Central Time zone. It shares its territory with overlay code 512, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 737 area code?
737 is a Texas area code covering Austin and surrounding Central Texas counties, including Round Rock and San Marcos. In the wider directory it sits in the South region.
Cities in the 737 area code
- Austin
- Round Rock
- Cedar Park
- Georgetown
- Pflugerville
- San Marcos
- Leander
- Kyle
- Hutto
- Buda
- Lakeway
- Bastrop
- Lockhart
- Burnet
Counties served by 737
Travis County, Williamson County, Hays County, Bastrop County, Caldwell County and Burnet County.
Time zone note: Almost all of Texas is Central; far-west El Paso is Mountain.
737 overlay codes and dialing
The 737 territory is covered by an overlay of 2 area codes: 512, 737. All of them serve the same geographic area, and the original code is 512. Because more than one code covers the same ground, 10-digit dialing is mandatory — you must dial the area code for every local call. New phone lines may be assigned any of these codes.
History of the 737 area code
737 went into service on July 1, 2013 as an overlay of 512, relieving number exhaustion in the Austin area. Rather than splitting the region, the overlay lets existing customers keep their numbers while new lines draw from the added code. Learn more in our overlay guide.
Is 737 a scam or spam risk?
737 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 737 number on your screen is no guarantee the caller is in Austin, TX or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Other Texas area codes
Explore more
See every code in Texas, compare codes across the South region, or view all Central Time codes. You can also browse the 7XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
737 area code FAQ
Where is the 737 area code?
The 737 area code is in Texas, covering Austin and surrounding Central Texas counties, including Round Rock and San Marcos, in the South region.
What cities are in the 737 area code?
Cities in the 737 area code include Austin, Round Rock, Cedar Park, Georgetown, Pflugerville, San Marcos, Leander, Kyle, Hutto and Buda.
What time zone is 737 in?
737 is in the Central Time zone. Almost all of Texas is Central; far-west El Paso is Mountain.
What is the overlay for the 737 area code?
737 shares its territory with 512. Both codes (512, 737) serve the same area, so 10-digit dialing is required for every call.
When did the 737 area code start?
737 went into service on July 1, 2013 as an overlay of 512.
Do I have to dial 10 digits for 737?
Yes. Because 737 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 737 a toll-free or premium code?
No. 737 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.