At present, there are 1,578 zip codes in the state of Illinois. There are separate area codes applicable for counties in the state. The state houses 102 counties and all of them can be located by the distinctive area codes. If you go through an Illinois Zip Codes Map, you will see the zip codes are highlighted with the city names, county borders, zip code borders, and freeways.
Last Updated Date: June 09, 2016