Area code
Area code 520 — Tucson, AZ
Arizona · in service since March 19, 1995
Area code 520 covers Tucson, AZ. It was created from area code 602 on March 19, 1995 and no other code overlays it.
Local time in Tucson
Spam reports from Sep 23 – Oct 22, 2026
High #12 of 461 codes
1,366 FTC complaints
Consumer reports, not verified by the FTC.
See the reports- Time zoneMountain Standard Time (no daylight saving)
- Local calls10 digits
- Prefixes710 assigned
- Runs out~3Q 2031
- Unwanted call?Block & report
Spam call reports about 520 numbers
Complaints by week
Sep 11 – Oct 22, 2026Show as table
| Week starting | Complaints |
|---|---|
| Sep 7 (3 days) | 70 |
| Sep 14 | 318 |
| Sep 21 | 312 |
| Sep 28 | 297 |
| Oct 5 | 294 |
| Oct 12 | 320 |
| Oct 19 (4 days) | 237 |
Compared with all codes
- Robocalls
- 76%all codes 75%
- Callers with the same code
- 44%all codes 35%
- Rank by complaints
- #12of 461 · top tenth (most complaints)
- FCC complaints, Oct 2025 – Sep 2026
- 25753 about text messages
What the calls were about
Sep 11 – Oct 22, 2026
| Subject | Complaints | |
|---|---|---|
| Reducing your debt (credit cards, mortgage, student loans) | 420 23% | |
| Calls pretending to be government, businesses, or family and friends | 188 10% | |
| Medical & prescriptions | 113 6% | |
| Dropped call or no message | 87 5% | |
| Vacation & timeshares | 24 1% | |
| Warranties & protection plans | 21 1% |
Where the people who complained live
Sep 11 – Oct 22, 2026
| State | Complaints | |
|---|---|---|
| Arizona | 936 51% | |
| California | 119 6% | |
| Florida | 97 5% | |
| Illinois | 66 4% | |
| Georgia | 49 3% |
October 2026 (partial) report · most reported
Consumer reports, not verified by the FTC · source
Source: FTC Do Not Call complaints created Sep 11 – Oct 22, 2026. They are reported by consumers and are not verified by the FTC; caller ID can be spoofed (how we count).
Source: FCC Consumer Complaints data, unwanted calls filed Oct 1, 2025 – Sep 30, 2026, by caller ID; not verified by the FCC.
Area code 520 location and prefixes
| Exchange (NANPA) | Place | County | Prefixes |
|---|---|---|---|
| TUCSON | Tucson | Pima County | 401 |
| SIERRAVIST | Sierra Vista | Cochise County | 70 |
| CASAGRANDE | Casa Grande | Pinal County | 67 |
| NOGALES | Nogales | Santa Cruz County | 31 |
| WILLCOX | Willcox | Cochise County | 18 |
| BENSON | Benson | Cochise County | 12 |
| BISBEE | Bisbee | Cochise County | 9 |
| DOUGLAS | Douglas | Cochise County | 9 |
| HAYDEN | Hayden | spans 2 counties | 9 |
| SAN MANUEL | San Manuel | Pinal County | 8 |
Plus 27 smaller exchange areas.
Source: NANPA CO codes of Oct 23, 2026; places: U.S. Census Bureau, matched by DialWhere (how).
Is 520 running out of numbers?
Previous forecast (October 2025): 2030, moved later by 1 year.
Forecast exhaust year by edition
Source: NANPA NRUF forecast, April 2026 edition.
Who holds 520 prefixes
The five largest of 53 original holders
As listed by NANPA, not today’s carrier.
| Holder (as listed) | Prefixes | |
|---|---|---|
| Qwest Corporation | 201 28% | |
| Verizon Wireless | 104 15% | |
| T-Mobile USA, Inc. | 84 12% | |
| New Cingular Wireless PCS, LLC | 53 7% | |
| Onvoy, LLC | 47 7% |
Source: NANPA CO codes of Oct 23, 2026.
Questions about area code 520
What area code is 520?
An Arizona area code, in service since March 19, 1995.
Where is 520 area code, and what time zone is it in?
Tucson, AZ; Mountain Standard Time (no daylight saving).
Why am I getting spam calls from 520?
1,366 FTC complaints from Sep 23 – Oct 22, 2026, most often about debt reduction (not verified by the FTC; caller ID can be spoofed).
Will 520 get a new area code?
NANPA forecasts exhaust in 3Q 2031; no relief planning listed.