Zip Code Listings for Sioux City, Iowa The following are the areas codes and zip codes for Sioux City, Iowa 51101 (area code: 712)
51102 (area code: 712)
51103 (area code: 712)
51104 (area code: 712)
51105 (area code: 712)
51106 (area code: 712)
51108 (area code: 712)
51109 (area code: 712)
51111 (area code: 712)