Area Code 312
Information on the 312 Area Code
This area code is located in IL. Coverage includes the following cities:
Chicago Zone 1
Chicago Zone 4
Chicago Zone 7
Community Support And Referral Services
Directory Assistance
Emergency Services
Fgb Access Code
Hinsdale
Information Provider
Intralata Pic Validation
La Grange
Non Emergency Police And Other Governmental Services
Northbrook
One Call Services-pipeline And Utility Safety
Roselle
Standard Plant Test Code
Telco Repair Service
Telecommunications Relay Service
Travel Information Services
Wheeling