Area code
928
928 is a United States area code. Under the North American Numbering Plan it belongs to Arizona, which has 5 area codes in total.
Validate a number in 928
Paste a full number and the tool checks it against the numbering plan. It returns the standard formats, the line type the plan assigns and the area code region.
Digits with or without punctuation work. Numbers outside the US are read with the +country code.
Area code 928 at a glance
NANPA lists 631 central office codes (prefixes) in use in area code 928, held by 50 holders across 94 rate centers.
| Fact | Value |
|---|---|
| In service since | 2001-06-23 |
| Time zone | Mountain (M) |
| Prefixes in use | 631 |
| Pooled prefixes | 460 (73%) |
| Rate centers | 94 |
| Companies holding prefixes | 50 |
| Assignment dates on file | 2001-02-22 to 2026-01-14 (305 prefixes) |
| ZIP codes in its places | 83 |
Rate centers in area code 928
| Rate center | Prefixes | Share |
|---|---|---|
| YUMA | 65 | 10% |
| FLAGSTAFF | 63 | 10% |
| PRESCOTT | 51 | 8% |
| SEDONA | 41 | 6% |
| SAFFORD | 34 | 5% |
| KINGMAN | 25 | 4% |
| BULLHEADCY | 19 | 3% |
| LKHAVASUCY | 19 | 3% |
| 86 other rate centers | 314 | 50% |
Who holds the prefixes in 928
Qwest holds the most prefixes, 95 (15%). 73% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| Holder | Prefixes | Share |
|---|---|---|
| Qwest | 95 | 15% |
| Verizon Wireless | 90 | 14% |
| Onvoy | 66 | 10% |
| New Cingular Wireless PCS | 44 | 7% |
| T-Mobile USA | 40 | 6% |
| Teleport Communications America | 31 | 5% |
| 44 other carriers | 265 | 42% |
A prefix holder is the company a code was assigned to, not necessarily a number's current carrier, because numbers can be ported to another company. Find which carrier a number is on, or browse the prefix holders.
History of area code 928
- 1995-03-19 Area code 520, named as the parent of 928 in the NANPA report, was in service.
- 2001-06-23 Area code 928 went into service.
Area codes nearest to 928
Distance is measured between the centers of the ZIP code places each area code serves, so it is a rough guide.
ZIP codes in area code 928
83 ZIP codes fall in places that have a rate center in this area code.
| Place | ZIP codes |
|---|---|
| Flagstaff, AZ | 6 |
| Prescott, AZ | 6 |
| Sedona, AZ | 5 |
A ZIP code and an area code are unrelated systems. A ZIP code can sit in more than one area code, and an area code spans many ZIP codes.
Complaints on file for 928 numbers
2,816 FCC complaints are on file for 2,215 numbers in 928, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 128 |
| 2024 | 157 |
| 2025 | 167 |
Other area codes in Arizona
Arizona is one state with 5 area codes in the NANPA table. 928 is one of them.
Next to 928 in the numbering table
These are the codes just before and after 928 when all are sorted by number. They are neighbours on the list, not necessarily on the map.
What the area code does and does not tell you
A number that starts with 928 was first assigned in Arizona. That is a fact about where the number began, and it is a useful hint when you check a form entry, for example a billing address in Arizona next to a 928 phone number.
It does not show where the person is today. A number stays with its owner after a move or a change of provider (number portability), and mobile numbers travel with the handset. The area code also cannot tell you whether the line is active, who the carrier is, or whether the number is mobile or fixed: the plan shares those ranges. Read more about the area code, the numbering plan and line type.
Check numbers in bulk with the API
| Product | Credits | Docs |
|---|---|---|
| Phone Numbering-Plan Validation | 1 credit per valid number | API docs |
| Phone Intelligence (carrier and line status) | 1 credit per check (invalid numbers outside the US and Canada are free) | Product page |
Questions about area code 928
Where is area code 928?
NANPA assigns area code 928 to Arizona, United States.
In which state does area code 928 sit?
Arizona. 928 is one of 5 area codes the NANPA table assigns to the state.
Which places does area code 928 cover?
The places with the most ZIP codes among the rate centers in 928 are Flagstaff, AZ, Prescott, AZ and Sedona, AZ. The rate center list on this page shows all of them.
Who owns area code 928?
NANPA assigns area codes. Within 928, Qwest holds the most prefixes, 95 prefixes or 15%.
Which time zone does 928 use?
The NANPA NPA report lists the time zone for 928 as Mountain (M).
What year did 928 enter service?
The NANPA NPA report gives an in-service date of 2001-06-23, so 928 has been in use since 2001.
Does area code 928 have an overlay?
The NANPA NPA report lists no other area code in an overlay with 928.
Which area codes are nearest to 928?
The area codes closest to 928, measured between the centers of the ZIP code places they serve, are 480 (about 80 miles), 602 (about 80 miles), 623 (about 80 miles), 520 (about 137 miles) and 702 (about 221 miles).
How many prefixes does area code 928 have?
NANPA's report dated 2026-10-17 lists 631 prefixes in service in 928, spread over 94 rate centers and 50 holders.
Are there complaints about 928 numbers?
The FCC data on file has 2,816 complaints for 2,215 numbers in 928. They are unverified consumer reports. A number with no complaints on file is not proven safe.
Area code assignments: North American Numbering Plan Administrator NPA report, file dated 10/17/2026, retrieved 2026-10-17. Source file. New codes are assigned several times a year. Prefixes, rate centers, holders, time zone, in-service date and overlays: NANPA central office code report dated 2026-10-17 and NPA report dated 2026-10-18. Complaints: FCC consumer complaints open data, fetched 2026-10-17. ZIP code places: Postal code places and coordinates: GeoNames (geonames.org), licensed CC BY 4.0.