621 area code
Where the 621 area code is, its overlay and how to dial a +1 621 number from anywhere.
The 621 area code is in Texas, United States (Central (CT)). To call from abroad: +1 621 555-0123. It is an overlay, so all 10 digits are dialled.
The 621 area code is a geographic North American Numbering Plan (NANP) code covering Texas. It has been in service since 13-Oct-2023 and sits in the Central (CT) time zone.
How to dial a 621 number
+1 621 555-01231 621 555-0123621 555-0123Other Texas area codes
Frequently asked questions
Where is the 621 area code?
The 621 area code is in Texas, United States (Central (CT)).
Is 621 an overlay area code?
Yes. 621 overlays the same region as 281, 346, 713, 832, so callers dial all 10 digits.
Do I have to dial 10 digits for 621?
Yes — dial the area code plus the seven-digit number.
How do I call a 621 number from another country?
Dial your exit code (or +), then 1, then 621, then the number: +1 621 555-0123.
Source: NANPA numbering plan. An area code covers a region, not a precise address — a 621 number does not pinpoint a street or ZIP code.
Number holders in area code 621
Each prefix (the three digits after the area code) is assigned by NANPA to one telephone company. 14 prefixes are in use in 621, shared by 1 companies. The largest holders:
| Company | Prefixes | Share |
|---|---|---|
| Multiple Ocn Listing | 14 | 100% |
Source: NANPA central office code assignments. A number keeps its original prefix when it is ported to another carrier.
All US area codes United States +1 Map of area code 621 — cities & rate centres