712 Area CodeSioux City, IA
Area code 712 covers Sioux City and nearby communities in Iowa, in the Central Time (CT) zone, home to about 430,000 people across 278 cities. It's the only area code for this region, so the three digits alone place the caller.
Where is area code 712?
Area code 712 serves part of Sioux City, IA and the surrounding areas. It is a unique area code with no overlays.
Overview of the 712 Area Code
What is the 712 area code?
The 712 area code serves Sioux City, Iowa. When you see a 712 number, it indicates a local number within this geographic area.
Why was area code 712 created?
The 712 area code was established to serve the Sioux City region in Iowa. It provides telephone number coverage across 278 cities.
Geographic Coverage of the 712 Area Code
The 712 area code serves Sioux City and surrounding areas in Iowa. It operates within the Central Time (CT) time zone. This area code covers several key cities, including:
- Sioux City
- Council Bluffs
- Storm Lake
- Spencer
- Le Mars
- Carroll
Got a call from a 712 number? It came from Sioux City, IA. No other area code overlaps the 712 territory, so the prefix alone identifies where the caller is. Inside 712, Sioux City holds about 20% of the population; the rest is split across 277 smaller cities.
Sioux City Area Code Overview
The 712 area code provides comprehensive telephone coverage for Sioux City and its surrounding communities. As the sole area code for this region, it uniquely identifies all local numbers within the service area.
What cities does area code 712 cover?
| City | State | Population | % of Area Code | % of City |
|---|---|---|---|---|
| Sioux City | IA | 86,875 | 0% | 100% |
| Council Bluffs | IA | 62,665 | 0% | 99% |
| Storm Lake | IA | 11,627 | 0% | 100% |
| Spencer | IA | 11,418 | 0% | 100% |
| Le Mars | IA | 10,674 | 0% | 100% |
| Carroll | IA | 10,125 | 0% | 100% |
| Sioux Center | IA | 8,675 | 0% | 100% |
| Denison | IA | 8,302 | 0% | 100% |
| Atlantic | IA | 6,717 | 0% | 100% |
| Orange City | IA | 6,547 | 0% | 100% |
* Sources: Population – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). Area code assignments – NANPA CO Code data. See our data methodology.
Has area code 712 been reported for unwanted calls?
Yes – 401 unwanted-call complaints were reported to the FTC for numbers showing a 712 area code (May 29 – Jul 2, 2026).
- 82% robocalls
- ↓ 6% vs prior period
Most-reported subjects
- Reducing your debt (credit cards, mortgage, student loans)47%188
- Other29%117
- Dropped call or no message6%26
* Caller ID is easily spoofed, so these figures reflect the number shown on caller ID, not the caller's true location – an area code alone never identifies a caller. The FTC does not verify the facts in these complaints. Source: FTC Do Not Call (DNC) Reported Calls Data, retrieved 2026-07-05.
Which prefixes and exchanges belong to area code 712?
60% assigned to a telco
- 78% Landline
- 22% Wireless
- 0% Unknown
| Prefix | Usage | Carrier |
|---|---|---|
| (712)200- | Landline | Alta Municipal Utilities |
| (712)201- | Landline | Onvoy |
| (712)202- | Landline | Mcleodusa Telecommunication Services |
| (712)203- | Wireless | T-Mobile Usa |
| (712)204- | Wireless | T-Mobile Usa |
| (712)205- | Landline | Windstream Iowa Communications |
| (712)206- | Landline | Windstream Iowa Communications |
| (712)207- | Landline | Walnut Telephone Company |
| (712)208- | Wireless | New Cingular Wireless Pcs |
| (712)209- | Wireless | Verizon Wireless |
Frequently Asked Questions about the 712 Area Code
Who called me from a 712 number?
A 712 number is assigned to Sioux City, Iowa, so a call may come from there. But caller ID is easy to fake, and scammers often spoof a local 712 code to look nearby, so a 712 number doesn't prove the caller is local. Recently, 401 unwanted-call complaints were reported to the FTC for numbers showing the 712 code (82% flagged as robocalls). If you don't recognize the number, let it go to voicemail; a real caller will leave a message.
Is 712 a scam area code?
No area code is a scam on its own. 712 is a normal, officially assigned code for Sioux City, Iowa. Spam callers spoof local codes to raise the odds you answer, so 712 on your caller ID says nothing about who is really calling. Recently, 401 unwanted-call complaints were reported to the FTC for numbers showing the 712 code (82% flagged as robocalls). Judge the call itself, not the area code.
Why do I keep getting calls from the 712 area code?
Repeated calls from different 712 numbers are usually spoofing: a robocaller rotates through 712 numbers so each call looks local and slips past simple blocks. Recently, 401 unwanted-call complaints were reported to the FTC for numbers showing the 712 code (82% flagged as robocalls). Blocking one number rarely helps; voicemail screening, your carrier spam filter, and the Do Not Call Registry work better.
Should I answer an unknown 712 number?
If you aren't expecting a 712 call, let it ring to voicemail. Legitimate callers leave a message, most robocallers hang up when no one picks up, and answering can mark your number as active and bring more calls.
How do I block calls from the 712 area code?
Block a single 712 number from your recent-calls list (iPhone: tap the number, then Block this Caller; Android: tap the number, then Block or report spam). To cut the volume, turn on Silence Unknown Callers on iPhone or spam protection on Android, enable spam filtering from your carrier, and register at DoNotCall.gov. Blocking the entire 712 code also stops legitimate local calls, so use it only as a last resort.
Where is area code 712?
Area code 712 covers Sioux City and the surrounding area in Iowa, spanning 278 cities with about 430,367 residents. No other code overlays this region, so 712 alone identifies the area.
Is 712 a real area code?
Yes. 712 is an active code in the North American Numbering Plan, assigned by NANPA and in service for Sioux City, Iowa. A real code can still show up on spoofed spam calls, so treat unknown 712 calls with normal caution.
What timezone is the 712 area code in?
The 712 area code is in the Central Time (CT). Because a number can be kept when someone moves or switches to VoIP, a specific 712 caller may not be in that zone.
How do I call a 712 number from abroad?
From outside the US, dial your country's exit code, then 1 (the US country code), then 712 and the seven-digit number. From a mobile phone you can usually just enter +1 712 followed by the number and let the phone add the exit code for you.