HomeIllinois312 area code   Which country code is 312?
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Where is area code 312? The area code for city is 312.
USA Telephone code 312 is dialed after the IDD. United States international dialing 312 is followed by an area code. The 312 area code table below shows the various city.Area code lookup for all cities or use the area codes locator to find which city a phone area code belongs to.
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