Houston is served by four area codes – 713, 281, 832, and 346 – all overlaying the same sprawling metro. 713 covers the urban core, 281 covers the suburban ring, and 832 and 346 blanket the entire region. Because these codes overlay one another, 10-digit dialing is required throughout Houston.
Fast Facts: Houston Area Codes
| City | Houston, Texas |
| Primary Area Code(s) | 713, 281 |
| Overlay Area Code(s) | 832, 346 |
| Time Zone | Central Time (CT) – CST / CDT |
| Major Counties | Harris (also Fort Bend & Montgomery) |
| Dialing | 10-digit required |
Area Codes in Houston – Detailed Breakdown
713 – Inner Houston (the core)
The original Houston area code, in service since 1947, 713 covers the urban core – Downtown, the Inner Loop, and the neighborhoods inside and around Interstate 610.
281 – Suburban Houston (the ring)
Created in 1999, 281 was assigned to the suburban ring around Houston, including the outer Harris County communities and nearby suburbs.
832 – Houston metro overlay
Added in 1999 as an overlay covering both the 713 core and the 281 ring, 832 serves the entire Houston metropolitan area.
346 – Houston metro overlay (newest)
Introduced in 2014 as the newest overlay, 346 covers the same Houston metro region and appears mostly on recently activated numbers.
Neighborhoods & District Mapping
Within the Inner Loop, the 713 code is most associated with neighborhoods like Downtown, Midtown, Montrose, the Heights, River Oaks, the Museum District, the Texas Medical Center, and the Galleria/Uptown area – though all four codes are now mixed throughout. The 281, 832, and 346 codes are common across the wider metro, including suburbs such as Katy, Sugar Land, The Woodlands, Pearland, Pasadena, and Cypress in Harris, Fort Bend, and Montgomery counties.
Houston is the largest city in Texas and the fourth-largest in the United States, and its economy is a global hub for the energy industry, the Port of Houston, aerospace (NASA’s Johnson Space Center), and one of the largest medical complexes in the world at the Texas Medical Center. Decades of rapid growth exhausted the original 713 code, which is why the metro now shares four overlapping codes and every local call requires 10 digits.
Local Dialing Rules & International Calls
Because Houston is covered by four overlapping area codes, 10-digit dialing is mandatory for every local call – you must dial the area code plus the seven-digit number even within the same neighborhood. To call a Houston number from outside the United States, dial your country’s exit code, then +1 (the North American country code), then the 10-digit number (area code + seven-digit line number).
Major ZIP Codes in Houston
Houston ZIP codes run roughly 77002–77099 in the city, with suburban communities such as Katy (77449–77494), Sugar Land (77478–77498), and The Woodlands (77380–77389) covered by the same 713/281/832/346 region.
Spam & Scam Call Warnings in Houston
Scammers often spoof local Houston numbers to seem trustworthy. Watch for these tactics reported across the area:
| Scam Type | What to Watch For |
|---|---|
| Utility Shut-off | Fake CenterPoint Energy reps threatening to cut power unless you pay immediately by gift card. |
| Storm / Hurricane Repair Scam | Fake contractors demanding upfront payment for hurricane or flood damage repairs – common after Gulf storms. |
| IRS / Tax Scam | Callers threatening arrest over supposed unpaid taxes, demanding gift cards or wire transfers. |
| Oilfield / Energy Job Scam | Fake energy or oilfield job offers seeking personal data or upfront “equipment” fees. |
Red Flag: The IRS, Social Security Administration, and utilities like CenterPoint Energy will never demand immediate payment by gift card, wire transfer, or cryptocurrency. Hang up and verify using an official number.
↑ See the complete list of All US Area Codes by State – every area code across all 50 states in one directory.
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Frequently Asked Questions
What area codes does Houston use?
Houston uses four area codes: 713 for the urban core, 281 for the suburban ring, and 832 and 346 overlaying the entire metro.
Do I have to dial 10 digits in Houston?
Yes. Because Houston’s area codes overlay one another, you must dial the full 10-digit number for every local call.
Is 621 a Houston area code?
No. Houston is served by 713, 281, 832, and 346. The code 621 is not an assigned Houston area code, so beware of any listing that shows it.
Which area code is the original Houston code?
713 is the original Houston area code, in use since 1947, and covers the urban core inside and around Loop 610.
Stay Safe & Explore More
- Verify an unknown caller in our Scam Alerts directory.
- Comparing nationwide numbers? See our Toll-Free Numbers guides.