Hillsdale IL ZIP Code
Hillsdale 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 Hillsdale IL zip code by its streets and block numbers if we have some of the Hillsdale streets loaded in our website
Hillsdale Area Code is 309 and Time Zone is Central (GMT -06:00).
Hillsdale Zip Code - Illinois
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Hillsdale City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Hillsdale ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Hillsdale, Illinois.
The Hillsdale Zip Code is 61257.
If you want to send a mail to Hillsdale City, you should use the 61257 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Hillsdale 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 61257 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Hillsdale 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.