Chicago Area Codes, Illinois, United States
How to call Chicago, Illinois?
Chicago has 3 area codes. To call Chicago you need to dial the United States country code (+1) and one of the following area codes:
312 773 872How to know if I'm receiving calls from Chicago, Illinois?
You are receiving calls from Chicago when the phone number starts with one of the following combinations:
1-312 1-773 1-872Other area codes in United States
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