Arizona area codes
Arizona uses 5 area codes. The oldest is 602, in service since 1947; the newest is 928, from 2001. Across them 3,182 of 3,930 possible number blocks are allocated, 81.0% of capacity. 480 and 602 are at or past 95%, which is why new numbers there come from overlays rather than the original code. Lumen holds 32.2% of the 3,182 assigned blocks across the state, ahead of Verizon at 17.9%; a further 8.5% sits with CLEC and VoIP holders outside the national carriers. In the 33 days to 30 October 2026, FTC complaints named an Arizona caller ID 5,738 times – 2.5% of all complaints in the window, most often 520 with 1,592 (6th of 422 nationally). NANPA records 134 rate centers across the state's codes, and local calls take all ten digits.
All 5 codes
| Code | In service | Blocks used | Largest holder | Complaints | Shares area with |
|---|---|---|---|---|---|
| 480 | 1999 | 784/786 | Lumen 35.2% | 1,216 | 602, 623 |
| 520 | 1995 | 699/786 | Lumen 33.2% | 1,592 | no overlay |
| 602 | 1947 | 748/786 | Lumen 37.8% | 931 | 480, 623 |
| 623 | 1999 | 314/786 | Lumen 35.4% | 598 | 480, 602 |
| 928 | 2001 | 637/786 | Other CLEC / VoIP 22.3% | 1,401 | no overlay |
Block share is share of allocated number blocks, not of subscribers. Complaint counts cover 28 Sep – 30 Oct 2026 and reflect spoofed caller IDs as much as real calls.
How full Arizona’s codes are
A code holds at most 786 blocks of 10,000 numbers each. When a code fills up, the administrator does not reclaim numbers – it adds an overlay, and from then on new numbers in the same area come from the new code.
Full or nearly full
Who holds the number blocks
Counted from every assigned block in the state: 3,182 blocks, each with the holder NANPA recorded for it. Percentages are measured, not estimated.
| Holder | Blocks | Share of Arizona | Largest in |
|---|---|---|---|
| Lumen | 1,026 | 32.2% | 4 codes |
| Verizon | 568 | 17.9% | – |
| T-Mobile | 373 | 11.7% | – |
| AT&T | 363 | 11.4% | – |
| Other CLEC / VoIP | 270 | 8.5% | 1 code |
| Onvoy | 215 | 6.8% | – |
| Bandwidth | 70 | 2.2% | – |
| Allstream | 66 | 2.1% | – |
| Comcast | 65 | 2% | – |
| Frontier | 56 | 1.8% | – |
| Charter | 26 | 0.8% | – |
| Spok | 23 | 0.7% | – |
“Other CLEC / VoIP” is not one company: it is every holder outside the national carriers counted together, which is what resellers and app-based numbers look like in the records. This is allocation, not subscribers.
Spam complaints naming Arizona codes
FTC Do Not Call complaints where the caller ID shown was a Arizona number, 28 Sep – 30 Oct 2026 (33 days). Caller IDs on spam calls are routinely faked, so these are complaints about the code, not calls proven to come from it.
| Code | Complaints | National rank |
|---|---|---|
| 520 | 1,592 | #6 of 422 |
| 928 | 1,401 | #8 of 422 |
| 480 | 1,216 | #20 of 422 |
| 602 | 931 | #52 of 422 |
| 623 | 598 | #173 of 422 |
What people said the calls were about
- Other – 416
- Calls pretending to be government, businesses, or family and friends – 150
- Medical & prescriptions – 115
- Reducing your debt (credit cards, mortgage, student loans) – 78
Topics as the complainant chose them, for the codes where the FTC published a topic.
How Arizona got its codes
1 in the 1940s, 3 in the 1990s, 1 in the 2000s. Each code after the first was split off from or overlaid on one already in service.
- 1947 602 goes into service.
- 1995 520 goes into service, split from or overlaid on 602.
- 1999 480 goes into service, split from or overlaid on 602.
- 1999 623 goes into service, split from or overlaid on 602.
- 2001 928 goes into service, split from or overlaid on 520.
Time zones
Arizona is in Mountain time.
Frequently asked about Arizona area codes
How many area codes does Arizona have?
5 in service. They are 480, 520, 602, 623 and 928.
What is the oldest area code in Arizona?
602, in service since 1947. Every later code in the state was split off from or overlaid on an existing one.
What is the newest area code in Arizona?
928, from 2001, overlaying 520.
Is Arizona running out of numbers?
480 and 602 are at or past 95% of capacity, but NANPA has not opened relief planning for them, so no new code is announced.
What time zone is Arizona in?
Mountain time.
Which Arizona area code gets the most spam complaints?
520 – 1,592 FTC complaints in the 33 days to 30 October 2026, 6th of 422 codes nationally. Those are complaints about the caller ID shown, and spam callers routinely fake a local-looking number, so this says the code is imitated often, not that the calls come from there.
Which carrier holds the most Arizona numbers?
Lumen, with 32.2% of the 3,182 blocks assigned across Arizona, ahead of Verizon at 17.9%. This is allocation of blocks by the numbering administrator, not a count of subscribers – people keep their numbers when they switch carriers.
Do you have to dial 10 digits in Arizona?
Yes. Every code in the state is in an overlay or ten-digit dialing area, so a local call needs the area code too. Dialing seven digits reaches a recording, not a wrong number.
Sources and verification
- NANPA – NPA Database (npa_report.csv), file date 11/01/2026, retrieved Nov 1, 2026
- NANPA – CO Code Assignment Records, All States (utilized), file updated 11/01/2026, retrieved Nov 1, 2026
- FTC – Do Not Call Reported Calls Data, 28 Sep – 30 Oct 2026, retrieved Nov 1, 2026
Figures on this page are counted from those files, not copied from other sites. Spotted an error? Request a correction. How we collect and check: methodology.