Dupo IL ZIP Code
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Dupo city is located in Illinois State, Saint Clair County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Dupo IL zip code by its streets and block numbers if we have some of the Dupo streets loaded in our website
Dupo Area Code is 618 and Time Zone is Central (GMT -06:00).
Dupo Zip Code - Illinois
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Dupo City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Dupo ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Dupo, Illinois.
The Dupo Zip Code is 62239.
If you want to send a mail to Dupo City, you should use the 62239 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Dupo 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 62239 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Dupo 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 Illinois.