712 area code — Sioux City, IA geographic
- State
- Iowa
- Major area
- Sioux City
- Time zone
- Central
- In service since
- 1947-01-01
- Active prefixes
- 627
- Rate centers
- 244
- Carriers
- 113
- Projected exhaust
- 2Q 2039
The 712 area code covers Sioux City, Iowa, Central time zone, and dates back to January 1, 1947. 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 627 active NXX prefixes in 712, assigned to 113 carriers. 428 of those prefixes are pooled — shared between carriers in thousands-number blocks. The code spans 244 rate centers (billing localities).
The dialing plan is 7D for home-NPA local calls and 10D across codes.
Among Iowa codes, 712 stands out as covers more rate centers (244) than any other Iowa area code.
To check where a specific 712 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.
Official projections put exhaust at 2Q 2039.
Largest localities in 712
| Locality (rate center) | Active prefixes | Also served by |
|---|---|---|
| Sioux City | 71 | — |
| Council Bluffs | 29 | — |
| Sergeant Bluff | 13 | — |
| Spencer | 11 | — |
| Le Mars | 10 | — |
| Carroll | 9 | — |
| Storm Lake | 8 | — |
| Harlan | 8 | — |
| Atlantic | 7 | — |
| Denison | 7 | — |
FAQ
Why am I getting spam calls from 712 numbers?
Scammers spoof recognizable area codes so calls look local or familiar. A displayed 712 number does not prove the call originated there — see our guide to spotting spoofed calls.
Where is a 712 number from?
712 is assigned to Sioux City and surrounding areas of Iowa in the Central time zone. The three digits after the area code (the prefix) narrow it down to a rate center.
Is 712 a toll-free number?
No. 712 is a geographic code; calls are billed like any other domestic call. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.