Iowa · Central Time
712 Area Code
The 712 area code is a telephone area code in Iowa, covering Sioux City and the surrounding area. It lies in the Central Time zone.
Last updated June 5, 2026
Where is the 712 area code?
712 serves Sioux City and nearby communities in Iowa. In the wider directory it sits in the Midwest region.
Dialing 712
Sioux City is currently served by the single area code 712. Ten-digit dialing (area code + seven-digit number) always works and is increasingly the norm nationwide; some local calls may still connect with seven digits. If a future overlay is added, 10-digit dialing would become mandatory.
History of the 712 area code
712 is one of the original area codes assigned in 1947, when AT&T and Bell Laboratories created the North American Numbering Plan and divided the country into the first 86 numbering plan areas. It has served the Sioux City area ever since.
Is 712 a scam or spam risk?
712 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 712 number on your screen is no guarantee the caller is local or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Other Iowa area codes
Explore more
See every code in Iowa, compare codes across the Midwest region, or view all Central Time codes. You can also browse the 7XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
712 area code FAQ
Where is the 712 area code?
The 712 area code is in Iowa, serving Sioux City and the surrounding area in the Midwest region.
What time zone is 712 in?
712 is in the Central Time zone.
Do I have to dial 10 digits for 712?
Ten-digit dialing always works, and many areas now require it; some local calls in this area may still connect with seven digits.
Is 712 a toll-free or premium code?
No. 712 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.