Oswego IL ZIP Code
Oswego city is located in Illinois State, Kendall County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Oswego IL zip code by its streets and block numbers if we have some of the Oswego streets loaded in our website
Oswego Area Code is 630/331 and Time Zone is Central (GMT -06:00).
Oswego Zip Code - Illinois
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Oswego City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Oswego ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Oswego, Illinois.
The Oswego Zip Code is 60543.
If you want to send a mail to Oswego City, you should use the 60543 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Oswego 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 60543 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Oswego 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.