712 area code
Sioux City area, Central Time.Area code 712 covers Sioux City, Council Bluffs, Sergeant Bluff and 241 more places in Iowa, on Central Time.
Right now in Sioux City
Central Time (CST, UTC-6; CDT, UTC-5 in summer)
Calling hours: Every day, 8 AM to 9 PM (the federal rule)
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Where 712 numbers come from
Numbers are issued by rate center, a billing area named for its main town. 712 has 244. Each one's share is how many 712 numbers start there. Its biggest metro area is Omaha, NE-IA.
- Sioux City11%
- Council Bluffs5%
- Sergeant Bluff2%
- Spencer2%
Also: Le Mars, Carroll, Harlan, Storm Lake, Atlantic, Denison, Red Oak, Cherokee, Emmetsburg, Onawa, Spirit Lake, Carter Lake + 228 more
Share of exchanges (blocks of 10,000 numbers). Source: NANPA rate center and exchange reports, November 10, 2026
When can you call a 712 number?
Sales calls to homes and cell phones have legal hours, set by the federal rule. Hold every 712 number to them, since you can't tell a work line from a personal cell.
What applies to 712Every day, 8 AM to 9 PM
- Federal (TCPA and FTC rule)Every day, 8 AM to 9 PMCalls to residential and mobile numbers. Most calls to businesses are exempt from the FTC's rule.47 CFR 64.1200(c)(1); 16 CFR 310.4(c) (opens in a new tab)
Local time comes from the area code, not from where the person is today. Mobiles keep their number when they move. Calling hours here are a guide, not legal advice. Every state's calling hours, with sources
The 712 area code
712 is one of the original area codes from 1947. Local calls can still be dialed with 7 digits.
- 1947712 starts
Source: NANPA area code database
Other Iowa area codes
All Iowa area codesCalling a list of 712 numbers?
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712 area code FAQ
What area code is 712?
712 is an Iowa area code for Sioux City, Council Bluffs, Sergeant Bluff, Spencer and 240 more places.
What time zone is the 712 area code in?
Central Time (CST, UTC-6; CDT, UTC-5 in summer).
What are the calling hours for 712 numbers?
Every day, 8 AM to 9 PM, local time, under the federal rule.
When did the 712 area code start?
In 1947: it's one of the original area codes.
Calling 712 numbers? Reach more of them.
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