Area Code 621: Texas, Texas
621 is a telephone area code serving Texas. It is part of the North American Numbering Plan and is dialed with the country code +1.
Numbers beginning with 621 are located in Texas, United States (NANP region: Houston).
How to Dial Area Code 621
| Calling from | What to dial |
|---|---|
| Anywhere in the US or Canada | 1 621 XXX-XXXX (10-digit dialing: 621 + 7-digit number) |
| Local call inside the same area code | 7-digit number in most areas; 10 digits where an overlay code is active |
| From the UK or Europe | 00 1 621 XXX XXXX |
| From Australia | 0011 1 621 XXX XXXX |
| From a mobile phone anywhere | +1 621 XXX XXXX |
Whatever country you are calling from, the + symbol replaces the exit code. Save the contact as +1 621 XXXXXXX and it will dial correctly from any phone in the world.
Time Zone for Area Code 621
Calls to a 621 number ring in the America/Chicago time zone, standard offset UTC-06:00. Daylight saving time applies here, so the offset moves forward one hour from March to November.
Note: El Paso County, Hudspeth County and part of northwestern Culberson County use Mountain time, one hour behind. Area code 915 is entirely on the Mountain side - see that page.
Other Area Codes in Texas
These codes also serve Texas. Area codes are assigned by the North American Numbering Plan Administration (NANPA).
| Area Code | Cities / Coverage |
|---|---|
| 210 | San Antonio |
| 214 | Dallas |
| 254 | Waco, Killeen |
| 281 | Houston (suburbs) |
| 325 | Abilene, San Angelo |
| 346 | Houston (overlay) |
| 361 | Corpus Christi |
| 409 | Beaumont, Galveston |
| 430 | East Texas (overlay) |
| 432 | Midland, Odessa |
| 469 | Dallas (overlay) |
| 512 | Austin |
| 682 | Fort Worth (overlay) |
| 713 | Houston (central) |
See all 28 area codes in Texas →
Frequently Asked Questions
Where is area code 621?
Area code 621 is in Texas, United States. It covers Houston (overlay for 281/346/713/832).
What time zone is area code 621 in?
Area code 621 rings in the America/Chicago time zone (UTC-06:00 standard).
Do I need to dial 1 before area code 621?
Yes, for a long-distance call inside the US and Canada you dial 1 first, then 621, then the seven-digit number. The 1 is the North American long-distance trunk prefix — it is not the country code. From outside North America you dial your exit code then 1 then 621.
Is area code 621 toll-free?
No. 621 is a standard geographic area code, so normal long-distance rates apply unless your plan includes them. Toll-free NANP codes are 800, 833, 844, 855, 866, 877 and 888.