Illinois is a midwestern U.S state situated in the Great Lakes region of the Midwestern United States. It is the sixth-largest state by the population of all U.S. states. It is best known as the “Land of Lincoln” as Abraham Lincoln. The nickname of the state is Prairie State. Illinois Zip Code started with the digit 6000. The total number of Illinois Zip Code approximately 1,568. The total population of Illinois about 12,671,821. So you can find any information about Illinois especially zip codes, area codes, Populations, cities, county and so on.