Caledonia IL ZIP Code
Caledonia city is located in Illinois State, Boone County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Caledonia IL zip code by its streets and block numbers if we have some of the Caledonia streets loaded in our website
Caledonia Area Code is 815 and Time Zone is Central (GMT -06:00).
Caledonia Zip Code - Illinois
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Caledonia City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Caledonia ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Caledonia, Illinois.
The Caledonia Zip Code is 61011.
If you want to send a mail to Caledonia City, you should use the 61011 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Caledonia 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 61011 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Caledonia 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.