Area code 623: where it is and who calls from it
Area code 623 is in Arizona.
Arizona (Phoenix metropolitan area; primarily the West Valley)
| Where | Arizona |
|---|---|
| Time zone | Mountain Time ยท local time |
| In service since | 1999 |
| Overlay | Yes, with 480, 602 |
| Prefixes assigned | 313 of 792 possible (40%) |
Overlay: 623 covers the same area as 480, 602. Overlay areas use 10-digit dialing, so a seven-digit number alone won't connect, and neighbors can have different area codes.
Where 623 numbers started
Every prefix is assigned to a rate center, the local calling area it was set up in. These are the biggest in 623, with how many prefixes each has.
Who holds 623 numbers
- Mobile carrier 33%
- Local phone company 32%
- Internet / business phone carrier 34%
- Phone company 2%
| Carrier | Type | Prefixes | Share |
|---|---|---|---|
| CenturyLink / Lumen | Local phone company | 99 | 32% |
| T-Mobile (including Sprint) | Mobile carrier | 39 | 12% |
| Onvoy | Internet / business phone carrier | 35 | 11% |
| Verizon Wireless | Mobile carrier | 31 | 10% |
| AT&T Mobility | Mobile carrier | 22 | 7% |
| MCImetro (Verizon Business) | Internet / business phone carrier | 13 | 4% |
| Level 3 (Lumen) | Internet / business phone carrier | 12 | 4% |
| Comcast | Internet / business phone carrier | 11 | 4% |
| Teleport Communications America | Internet / business phone carrier | 9 | 3% |
| Allstream | Internet / business phone carrier | 8 | 3% |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number.
States served: Arizona.
Other area codes in Arizona
Got a call from 623?
An area code tells you where a number was first assigned, not where the caller is. People keep their numbers when they move, and scammers can fake any number. If you weren't expecting the call, let it go to voicemail.
If the call shows a 623 number that matches the first six digits of your own, that's often neighbor spoofing. Use the box above to check the full number.
Area code facts from the NANPA area code database (updated 10/06/2026); prefixes and carriers from NANPA's central office code records (updated 2026-10-10). Place description adapted from Wikipedia, CC BY-SA 4.0.