712 area code
Area code 712 is in Iowa. It covers Sioux City, Council Bluffs, Storm Lake and 276 other places: 265 ZIP codes in Woodbury, Pottawattamie, Sioux and 29 other counties. Local time there is , Central Time. In service since 1947, with no overlay.
- State
- Iowa
- Time zone
- Central
- Largest city
- Sioux City
- Overlays
- none
- In service since
- 1947
- Rate centres
- 244
- Prefixes assigned
- 633 (6,330,000 numbers)
Who calls from a 712 number
NANPA records the carrier each block of 712 numbers is assigned to. Of the 5.4 million 712 numbers assigned, 37% are with local phone companies (Qwest (CenturyLink) and Windstream); 34% with cable, internet-calling, business and other carriers (Onvoy); 28% with mobile carriers (AT&T Mobility, Verizon Wireless and T-Mobile).
That is who the numbers were assigned to: people keep their number when they change carrier, so any one number may have moved since.
| Carrier | Kind | Share |
|---|---|---|
| Onvoy | Cable, VoIP, other | 12% |
| AT&T Mobility | Mobile | 10% |
| Verizon Wireless | Mobile | 10% |
| Qwest (CenturyLink) | Landline | 7% |
| Windstream | Landline | 6% |
| T-Mobile | Mobile | 5% |
An area code says where a number was issued, not where the caller is: people keep their numbers when they move, and caller ID can be set to show any number, which the FCC calls spoofing. If a call you did not expect asks for money or personal details, the FCC advises hanging up and calling the company back on a number you look up yourself. Unwanted calls can be reported to the FTC at ReportFraud.ftc.gov.
Places in area code 712
The 232 places with a telephone rate centre of their own using 712, largest first. Each links to its ZIP codes.
Nearby places using 712
These places have no rate centre of their own in NANPA's records; the nearest one uses 712. Near an area-code boundary that can be wrong for part of a town.
- Sioux Center
- Okoboji
- Honey Creek
- Twin Lakes
- Lakeside
- Orleans
- Wahpeton
- West Okoboji
- Mc Clelland
- Deloit
- Weston
- Bentley
- Truesdale
- Fostoria
- California Junction
- Hastings
- McClelland
- Arion
- Turin
- Hamlin
- Westfield
- Shambaugh
- Calumet
- Willey
- Rossie
- Tennant
- Oyens
- Gray
- Greenville
- Yorktown
- Chatsworth
- Loveland
- Craig
- Aspinwall
- Buck Grove
- Rodney
- Anderson
- Coburg
- Conway
- Blanchard
- Gruver
- Varina
- Jolley
- Yetter
- River Sioux
- Bartlett
- Corley
ZIP codes in area code 712
265 ZIP codes in 252 towns, by the town each is mailed to, largest first. Each links to its own page.
Where 712 numbers are issued
NANPA's rate centres with the most 712 prefixes (each prefix is 10,000 numbers), under NANPA's own abbreviated names.
| Rate centre | Place | Prefixes |
|---|---|---|
SIOUX CITY | Sioux City | 73 |
COUNCILBLF | Council Bluffs | 29 |
SERGENTBLF | Sergeant Bluff | 13 |
SPENCER | Spencer | 11 |
LE MARS | Le Mars | 10 |
CARROLL | Carroll | 9 |
Counties
The counties of its ZIP codes, most residents first, with how many of its ZIP codes each has.
- Woodbury County (21)
- Pottawattamie County (18)
- Sioux County (13)
- Plymouth County (11)
- Buena Vista County (8)
- Carroll County (11)
- Dickinson County (7)
- Clay County (10)
- Crawford County (12)
- Page County (11)
- Harrison County (10)
- Cass County (8)
- Mills County (7)
- Lyon County (8)
- Cherokee County (8)
- Shelby County (10)
- Montgomery County (7)
- Emmet County (5)
- Calhoun County (7)
- Sac County (8)
- O'Brien County (8)
- Monona County (9)
- Palo Alto County (7)
- Ida County (6)
- Fremont County (9)
- Pocahontas County (8)
- Osceola County (5)
- Audubon County (6)
- Taylor County (3)
- Guthrie County (2)
- Greene County (1)
- Adams County (1)
Which code covers where you are now? What area code am I in? answers from your location.
Questions about area code 712
Where is area code 712?
Area code 712 is in Iowa. It covers Sioux City, Council Bluffs, Storm Lake and 276 other places: 265 ZIP codes in Woodbury, Pottawattamie, Sioux and 29 other counties.
What ZIP codes are in area code 712?
265 ZIP codes, by the town each is mailed to: Sioux City (9, 51101 to 51111), Council Bluffs (3, 51501 to 51503), Storm Lake (50588), Spencer (51301) and 248 more towns. The full list is on this page.
What time zone is area code 712 in?
Central time.
Is a 712 number a mobile or a landline?
It can be either. 28% of 712 numbers are assigned to mobile carriers and 37% to local phone companies (NANPA, 2026-10-10); the rest are with cable, internet-calling, business and paging carriers. A number keeps its area code when it moves to another carrier.
Does a 712 number mean the caller is in Iowa?
Not necessarily. An area code says where the number was first issued. People keep their numbers when they move or switch carriers, and calling software can show any number, so a 712 call can come from anywhere.
Other area codes in Iowa
All 5 Iowa area codes, by area, with the cities each covers
Source: NANPA NPA database, central office code and thousands-block assignments, 2026-10-10. Places are matched to NANPA's rate centres by name; see sources.
Cite this page
zipcodes.pro. “Area code 712.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/area-code/712
Underlying data is public domain or openly licensed — sources, vintages and licences.