251 area code — Mobile, AL geographic
251 is the area code for Mobile, Alabama, in service since June 18, 2001, Central time. Because of number portability and VoIP, the area code tells you where the number was issued, not where the caller is right now.
NANPA lists 526 active NXX prefixes in 251, assigned to 48 carriers. 394 of those prefixes are pooled — shared between carriers in thousands-number blocks. The code spans 42 rate centers (billing localities).
To check where a specific 251 number was issued, look up its six-digit prefix; to check who is actually calling, ignore the display and verify through an official callback number — caller ID is assertable and routinely spoofed.
The dialing plan is 10D for home-NPA local calls and 10D across codes.
Official projections put exhaust at 1Q 2039.
Its parent code is 334, which it left in 2001.
Largest localities in 251
| Locality (rate center) | Active prefixes | Also served by |
|---|---|---|
| Mobile | 232 | — |
| Foley | 72 | — |
| Atmore | 16 | — |
| Jackson | 15 | — |
| Fairhope | 14 | — |
| Bay Minette | 13 | — |
| Brewton | 12 | — |
| Evergreen | 10 | — |
| McIntosh | 10 | — |
| Bellefontaine | 8 | — |
FAQ
Is 251 a toll-free number?
No. 251 is a geographic code; calls are billed like any other domestic call. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.
Will 251 run out of numbers?
NANPA's current forecast projects exhaust in 1Q 2039 — decades of capacity remain.
Why am I getting spam calls from 251 numbers?
Scammers spoof recognizable area codes so calls look local or familiar. A displayed 251 number does not prove the call originated there — see our guide to spotting spoofed calls.
Where is a 251 number from?
251 is assigned to Mobile and surrounding areas of Alabama in the Central time zone. The three digits after the area code (the prefix) narrow it down to a rate center.