Sioux City, IA ZIP Codes, Area Codes and Address Format

City guides  |   |  2 min read

Looking up ZIP codes or writing an address in Sioux City, Iowa? Below is a practical reference built from postal data for the city.

State
Iowa (IA)
County
Woodbury County
Standard ZIP codes
8
Time zone
Central

Sioux City ZIP codes

These are the standard delivery ZIP codes for Sioux City. The city has 9 ZIP codes in total when PO Box and unique codes are included.

  • 51101
  • 51103
  • 51104
  • 51105
  • 51106
  • 51108
  • 51109
  • 51111

Area codes in Sioux City

Sioux City phone numbers use 712. A single area code keeps local numbers easy to recognize.

Sample Sioux City addresses

Priya Williams 3298 Highland Rd Sioux City, IA 51105
Luis Smith 7533 Center St Ste 36A Sioux City, IA 51101

The street lines are invented; the city, state and ZIP codes are real. Use them for form testing, mockups and training materials, never for real orders.

How to write an address in Sioux City

  • End the address with SIOUX CITY, IA and the five-digit ZIP code.
  • Put apartment or suite numbers at the end of the street line.
  • Use USPS abbreviations such as ST, AVE and BLVD.
  • Match the ZIP code to the street. Sioux City has 8 codes, so the city name alone is not enough.

More Iowa cities

Davenport, Waterloo, Cedar Rapids, Iowa City, Boone, or see all Iowa cities.

Need test addresses in Sioux City? Generate as many as you need, with real ZIP codes and local area codes.

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