928 area code — Yuma, AZ geographic

Data: NANPA public reports, current as of July 28, 2026.

Phone numbers beginning 928 are registered to the Yuma area of Arizona (Mountain time zone). The code entered service on June 23, 2001. Note that porting and VoIP mean a 928 number can be used from anywhere — the code marks where the number was assigned.

631 central-office prefixes are currently active in this code, spread across 51 code-holding carriers. Thousands-block pooling applies to 460 prefixes, so a single prefix can belong to several carriers. Its prefixes map to 94 distinct rate centers.

Practical takeaway: the 928 label narrows geography to Arizona, the prefix narrows it to a locality, and neither authenticates a caller. Verification means calling back through a number you found yourself.

928 was created from 520 in 2001.

NANPA projects numbering capacity to exhaust in 3Q 2034.

Dialing: 10D locally, 10D to other codes (1+10 digit permissible at service provider discretion.).

Worth noting: 928 is covers more rate centers (94) than any other Arizona area code.

Largest localities in 928

FAQ

Will 928 run out of numbers?

NANPA's current forecast projects exhaust in 3Q 2034 — decades of capacity remain.

Why am I getting spam calls from 928 numbers?

Scammers spoof recognizable area codes so calls look local or familiar. A displayed 928 number does not prove the call originated there — see our guide to spotting spoofed calls.

Where is a 928 number from?

928 is assigned to Yuma and surrounding areas of Arizona in the Mountain time zone. The three digits after the area code (the prefix) narrow it down to a rate center.

Is 928 a toll-free number?

No. 928 is a geographic code; calls are billed like any other domestic call. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.