Area Code 621
Houston, Texas ยท 6:15 AM CDT now
Area code 621 at a glance
| State | Texas |
|---|---|
| Main area | Houston |
| Time zone | Central (CDT, 6:15 AM now) |
| In service since | 2025 (added to the area of 346) |
| Overlay | Yes, with 281 346 713 832 |
| Local dialing | Local calls are dialed with 10 digits (area code + number). |
Other Texas area codes
Area code 621 FAQ
Where is area code 621?
Area code 621 is assigned to Texas and covers Houston, according to the North American Numbering Plan Administrator (NANPA).
What time zone is area code 621?
Area code 621 is in the Central time zone.
Which area codes overlay 621?
621 shares its territory with 281, 346, 713, 832. In an overlay, numbers from all these codes are assigned in the same area, so local calls need the area code.
When did area code 621 start?
NANPA lists area code 621 as in service since 2025, when it was added to the area of 346.
Is a call from area code 621 a scam?
The area code alone can't tell you. Caller ID can be faked, so a 621 number may not come from Texas at all. Let unknown calls go to voicemail and never call back a number you don't recognize just to find out who it was.
Area code data: NANPA NPA report (file dated 09/28/2026). Times are shown at page load.