Warren IL ZIP Code
Warren city is located in Illinois State, Jo Daviess County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Warren IL zip code by its streets and block numbers if we have some of the Warren streets loaded in our website
Warren Area Code is 815 and Time Zone is Central (GMT -06:00).
Warren Zip Code - Illinois
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Warren City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Warren ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Warren, Illinois.
The Warren Zip Code is 61087.
If you want to send a mail to Warren City, you should use the 61087 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Warren 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 61087 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Warren 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.