Irwin ID ZIP Code
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Irwin city is located in Idaho State, Bonneville County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Irwin ID zip code by its streets and block numbers if we have some of the Irwin streets loaded in our website
Irwin Area Code is 208 and Time Zone is Mountain (GMT -07:00).
Irwin Zip Code - Idaho
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Irwin City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Irwin ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Irwin, Idaho.
The Irwin Zip Code is 83428.
If you want to send a mail to Irwin City, you should use the 83428 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Irwin 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 83428 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Irwin 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 Idaho.