Area code 520: where it is and who calls from it
Area code 520 is in Arizona.
Arizona (Tucson, Nogales, Fort Huachuca, and most of southeastern Arizona)
| Where | Arizona |
|---|---|
| Time zone | Mountain Time ยท local time |
| In service since | 1995 |
| Overlay | No |
| Prefixes assigned | 694 of 792 possible (88%) |
Where 520 numbers started
Every prefix is assigned to a rate center, the local calling area it was set up in. These are the biggest in 520, with how many prefixes each has.
Who holds 520 numbers
- Mobile carrier 37%
- Local phone company 30%
- Internet / business phone carrier 29%
- Phone company 4%
| Carrier | Type | Prefixes | Share |
|---|---|---|---|
| CenturyLink / Lumen | Local phone company | 203 | 29% |
| Verizon Wireless | Mobile carrier | 104 | 15% |
| T-Mobile (including Sprint) | Mobile carrier | 84 | 12% |
| AT&T Mobility | Mobile carrier | 53 | 8% |
| Onvoy | Internet / business phone carrier | 52 | 7% |
| Level 3 (Lumen) | Internet / business phone carrier | 29 | 4% |
| MCImetro (Verizon Business) | Internet / business phone carrier | 26 | 4% |
| Bandwidth | Internet / business phone carrier | 17 | 2% |
| Teleport Communications America | Internet / business phone carrier | 14 | 2% |
| MetroPCS (T-Mobile) | Mobile carrier | 11 | 2% |
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 520?
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 520 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.