The 737 area code is an overlay serving Austin, Texas and its surrounding metro, layered over the original 512 code. Introduced in 2013 to supply new phone numbers for the booming capital region, 737 covers the exact same territory as 512. If a 737 number has appeared on your caller ID, this guide explains where it comes from, how to dial it, and how to stay safe from spoofed calls.
Quick Summary: Area Code 737 at a Glance
| Detail | Information |
|---|---|
| Area Code | 737 |
| State | Texas (TX) |
| Major Cities | Austin, Round Rock, Cedar Park, San Marcos |
| Time Zone | Central Time (CT) |
| Country Code | +1 (USA) |
| Overlay Codes | 512 (co-located) |
Geographic Coverage & Major Cities
Area code 737 covers Austin and the surrounding Central Texas metro, including Travis, Williamson, and Hays counties. Because it is an overlay, it shares the identical footprint of the 512 area code rather than covering a separate zone.
Cities and communities served by the 737 area code include:
- Austin – the Texas state capital and a major tech and music hub
- Round Rock & Georgetown – fast-growing Williamson County suburbs
- Cedar Park & Leander – northwestern metro communities
- San Marcos & Pflugerville – college and commuter cities in the metro
As the newer code over the capital, 737 numbers are typically assigned to residents and businesses who obtained phone service after the original 512 numbers grew scarce.
A Brief History of Area Code 737
Area code 737 was activated in 2013 as an all-services overlay on the Austin region. The original 512 code dates to 1947; as the metro’s population surged, an overlay became necessary to avoid running out of numbers. An overlay adds a second area code across the same geographic area, so existing 512 customers kept their numbers while new lines could be assigned either 512 or 737, under mandatory 10-digit dialing.
Time Zone & Best Time to Call
Numbers in the 737 area code use Central Time (CT). The region observes Daylight Saving Time, shifting from CST (UTC-6) to CDT (UTC-5) between March and November each year.
How to Dial Phone Numbers in Area Code 737
Because 737 is an overlay of 512, the Austin area requires 10-digit dialing on every call.
Calling within the United States or Canada
- 10-digit dialing: Always include the area code – 737-XXX-XXXX.
- 11-digit dialing: You can also dial 1-737-XXX-XXXX; the leading 1 is the NANP country code.
Calling from outside the United States
- Format: [exit code] + 1 + 737 + XXX + XXXX
- From the UK, Europe, or most of Asia/Africa: 00 1 737 XXX XXXX
- From any mobile phone worldwide: +1 737 XXX XXXX
Is Area Code 737 a Scam? Safety & Protection Tips
Area code 737 is a legitimate Texas area code – a call from it is not fraudulent by default. However, scammers frequently spoof local codes like 737, faking the caller ID so their number appears to come from a trusted Austin line. Neighbor spoofing, which mimics the first six digits of your own number, is especially common.
Common scam tactics linked to this region
| Scam type | What to watch for |
|---|---|
| Government impersonation | Callers posing as the IRS, SSA, or a “state agency” threatening arrest |
| Bank & card fraud alerts | Claims of “suspicious activity” seeking your account details |
| Utility shut-off threats | Demands for immediate payment to avoid disconnection |
| Tech & job-offer scams | Fake recruiter or “IT department” calls targeting tech workers |
How to report, block, and look up 737 callers
- Never share personal or financial details with an unexpected caller, however urgent they sound.
- Block the number using your phone’s built-in call-blocking feature or a reputable call-screening app.
- Look up the number with a trusted reverse phone lookup before returning any call.
- Report it to the FTC at reportfraud.ftc.gov and register at DoNotCall.gov.
Nearby & Related Area Codes in Texas
Area code 737 shares and borders several other Texas codes:
- 512 – the original Austin code that 737 overlays (see our 512 area code guide)
- 210 & 726 – San Antonio to the southwest (see our 210 area code guide)
- 830 – the Texas Hill Country surrounding the metros
- 254 – Waco and Central Texas to the north
Explore more codes across the state on our Texas area codes hub, or browse every prefix in our US area codes directory.
↑ See the complete list of All US Area Codes by State – every area code across all 50 states in one directory.
Explore Neighboring States
Researching area codes just across the state line? Start with these codes in the states that border Texas:
Frequently Asked Questions About Area Code 737
Where is the 737 area code located?
Area code 737 covers Austin and the surrounding Central Texas metro, including Round Rock, Cedar Park, and San Marcos. It operates on Central Time as an overlay of area code 512.
What is the difference between 737 and 512?
There is no geographic difference. 737 is an overlay covering the exact same Austin-area territory as 512; it was added simply to supply more phone numbers as the region grew.
Is 737 a landline or cell phone area code?
Both. Area code 737 serves landlines, mobile phones, and VoIP numbers throughout the Austin metro.
Should I answer a call from an unknown 737 number?
If you are not expecting the call, let it go to voicemail. Legitimate callers leave a message, while spoofed or robocall numbers usually will not. Verify any unfamiliar number with a reverse lookup before calling back.
Related 737 Guides
- Is a 737 call safe? Read Is area code 737 a scam? Spam & safety guide.
- Local coverage: see the Austin area code guide.
- Worried about spam or robocalls? Browse our Scam Alerts directory.