Onawa IA ZIP Code
Onawa city is located in Iowa State, Monona County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Onawa IA zip code by its streets and block numbers if we have some of the Onawa streets loaded in our website
Onawa Area Code is 712 and Time Zone is Central (GMT -06:00).
Onawa Zip Code - Iowa
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Onawa City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Onawa ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Onawa, Iowa.
The Onawa Zip Code is 51040.
If you want to send a mail to Onawa City, you should use the 51040 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Onawa 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 51040 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Onawa 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.