Sioux City IA ZIP Code
Sioux City city is located in Iowa State, Woodbury County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Sioux City IA zip code by its streets and block numbers if we have some of the Sioux City streets loaded in our website
Sioux City Area Code is 712 and Time Zone is Central (GMT -06:00).
Sioux City Zip Code - Iowa
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Sioux City City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Sioux City ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Sioux City, Iowa.
The Sioux City Zip Code is 51101, 51102, 51103, 51104, 51105, 51106, 51108, 51109, 51111.
If you want to send a mail to Sioux City City, you should use the 51101, 51102, 51103, 51104, 51105, 51106, 51108, 51109, 51111 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Sioux City ZIP code system that it called ZIP+4, often called "plus-four codes", "add-on codes", or "add ons". A ZIP+4 code uses the basic 51101, 51102, 51103, 51104, 51105, 51106, 51108, 51109, 51111 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Sioux City city block, a group of apartments, an individual high-volume receiver of mail or any other unit that could use an extra identifier to aid in efficient mail sorting and delivery in Iowa.