USA Area Codes
Area Code Chicago, Area Code Cook
The city of Chicago is located in the state of ( county). The Chicago area codes are Cook. The US area codes have a fixed length of 3 digits. For Chicago local calls you need to dial an area code.
If you want to call from to Chicago you have to dial +1 Cook and the telephone number of the person you want to reach.
Last change: 23.04.2007
