Illinois City IL ZIP Code
Illinois City city is located in Illinois State, Rock Island County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Illinois City IL zip code by its streets and block numbers if we have some of the Illinois City streets loaded in our website
Illinois City Area Code is 309 and Time Zone is Central (GMT -06:00).
Illinois City Zip Code - Illinois
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Illinois City City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Illinois City ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Illinois City, Illinois.
The Illinois City Zip Code is 61259.
If you want to send a mail to Illinois City City, you should use the 61259 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Illinois City 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 61259 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Illinois City 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.