Onslow IA ZIP Code
Onslow city is located in Iowa State, Jones County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Onslow IA zip code by its streets and block numbers if we have some of the Onslow streets loaded in our website
Onslow Area Code is 563 and Time Zone is Central (GMT -06:00).
Onslow Zip Code - Iowa
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Onslow City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Onslow ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Onslow, Iowa.
The Onslow Zip Code is 52321.
If you want to send a mail to Onslow City, you should use the 52321 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Onslow 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 52321 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Onslow 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.