North American Numbers Source-cited · ownership disclosed
Area code
928
In service
United States · since 2001

Flagstaff / Yuma / northern Arizona

Went into service in 2001 as a split from 520, covering the northern, eastern, and western portions of Arizona; a standalone code with no overlay.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Flagstaff / Yuma / northern Arizona
Type
geographic
Status
in service
In service since
2001
Projected exhaust
2034 Q3

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 928 is

Northern, eastern, and western Arizona, including the Arizona section of the Navajo Nation and most of Greenlee County..

Communities served wholly or partly by 928:

FlagstaffYumaPrescottKingmanSedonaWinslowLake Havasu City

Also serves Grand Canyon, Holbrook, San Luis, Wickenburg, and portions of the western/northern edges of the Phoenix metro area.

B · Relationships

How it relates to other codes

The codes 928 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Split from · 2001 520 Tucson Split from 520 (which had itself split from 602 in 1995).
What's changing. Standalone (no overlay).
C · History

How 928 got here

2001-06-23
Area code 928 went into service; permissive dialing began July 2001.
Source: Wikipedia
2002-01-05
Mandatory dialing began.
Source: Wikipedia
2021-10-24
Transitioned to ten-digit dialing after the 988 central office code conflicted with the new nationwide 988 Suicide & Crisis Lifeline.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
647
Prefixes available
153
Thousands-blocks assigned
3,059

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 928 with another code →
Sources
Wikipedia ↗
Area code 928
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.