Area codes in Sioux City, Iowa

Sioux City, Iowa uses area code 712. The main Sioux City area code is 712.

Area codes serving Sioux City

Phone numbers in Sioux City are written as ten digits — for example (712) 555-0190 — and fall in the Central Time zone.

All Iowa area codes · Is a Sioux City call a scam?

Nearby cities

More cities in Iowa

Frequently asked questions

What is the area code for Sioux City?

The main area code for Sioux City, Iowa is 712.

How many area codes does Sioux City have?

Sioux City has 1 area code: 712.

How do you dial a Sioux City number?

Dial all 10 digits — the area code (712) followed by the 7-digit local number. From abroad, dial +1, then the area code and number.

Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of August 2, 2026. Refreshed monthly.