312, 773, 872
These are the telephone area codes for Chicago and the surrounding metro area.
How to Call Chicago from Overseas
- Dial your country's exit code (International Access Code)
- Dial 1 (USA country code)
- Dial the area code (312, 773, or 872)
- Dial the 7-digit local phone number
Example: Calling Downtown Chicago from the UK
00 1 312 555 6789
Where:
00 = UK exit code
1 = USA country code
312 = Downtown Chicago area code
555 6789 = Local Chicago phone number
Quick Facts
312
Primary Code
+1
Country Code
10-digit
Dialing Format
011
US Exit Code
Chicago Area Code Coverage
These area codes cover different parts of the Chicago region:
312 - Downtown Chicago
Original Chicago area code
773 - Chicago City Limits
Overlay for areas outside downtown
872 - Chicago Overlay
Additional overlay for 312/773
708 - Suburbs
Cook County suburbs (e.g., Oak Park, Cicero)
847 - North Suburbs
Lake County and northern suburbs
630 / 331 - West Suburbs
DuPage County and western suburbs
Major US Area Codes
Common Exit Codes for Calling USA
When calling Chicago from these countries, use these exit codes:
United Kingdom
00
Australia
0011
European Union
00
Japan
010
China
00
Canada
011