815 Area Code is part of 15 counties in the state of Illinois. There are around 206 cities in the 815 area code. The 815 area code is located in the EST timezone. Illinois has an avarage population of 12,947,252 spread between the coordinates of +40.349457 Latitude and -88.986137 Longitude.
Below you will find more info about 815 Area Code and also zip codes, counties, cities and the post offices that belong to this Area Code.