AZ
United States geographic area code, in service since 1947-01-01. Part of the 480/602/623 overlay complex — ten-digit dialing required.
Created 520. Created 480. Created 623. Overlaid with 480, 623 .
Prefix-level assignment does not equal number-level exhaustion; thousands-block pooling extends capacity. First assignment on record 2001-01-02, most recent 2026-09-14.
Area codes serve rate-center geographies, not municipal boundaries. “AZ” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | QWEST CORPORATION | 266 | 34.8% |
| 02 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 110 | 14.4% |
| 03 | T-MOBILE USA, INC. | 98 | 12.8% |
| 04 | NEW CINGULAR WIRELESS PCS, LLC | 48 | 6.3% |
| 05 | ONVOY, LLC - AZ | 33 | 4.3% |
| 06 | TELEPORT COMMUNICATIONS AMERICA, LLC - AZ | 25 | 3.3% |
| 07 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 22 | 2.9% |
| 08 | SPOK, INC. | 21 | 2.7% |
| 09 | COMCAST IP PHONE, LLC | 20 | 2.6% |
| 10 | METROPCS, INC. | 16 | 2.1% |
Important: these are initial assignees from NANPA CO-code records — the carrier a prefix was originally assigned to. Because of number portability, the current serving carrier of any individual number may differ.
Change history
Recorded events for this NPA- 1999-02-01 Jeopardy Conservation Procedures Announced for Arizona NPA 602 jeopardy
- 1947-01-01Area code 602 entered service.
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2021-12-30 | PL-576 ↗ | NPA 480, 602 and 623 Boundary Elimination Overlay (Arizona) |
| 2000-02-24 | PL-216 ↗ | Permissive Dialing Extended for Eleven Central Office Codes in the 602 NPA (Arizona) |
| 1999-07-21 | PL-181 ↗ | Urgent reminder to update networks for the 602 NPA Split in Phoenix, Arizona with the new 623 and 480 NPAs |
| 1999-02-01 | PL-153 ↗ | NANP-Split of the 602 (Arizona) Numbering Plan Area (NPA) and the Addition of the 480 and 623 NPA's |
| 1994-01-21 | IL-94-01-030 ↗ | NANP-SPLIT OF 602 (ARIZONA) NUMBERING PLAN AREA (NPA) |