Area code 312
Area code 312 is a telephone area code in the North American Numbering Plan. It serves Illinois, the United States.
- 312area code
- ILIllinois
- UScountry
- 1-Jan-47in service
How to dial a 312 number
From within the United States and Canada, dial 1, then 312, then the seven-digit number. From another country, dial your international access code, then +1 312 and the seven-digit number.
Area code 312 covers the same territory as 872. When several area codes share one area like this, it is called an overlay.
Other area codes in Illinois
217, 224, 309, 331, 447, 464, 618, 630, 708, 730, 773, 779, 815, 847, 861, 872
Frequently asked questions
Where is area code 312?
Area code 312 serves Illinois, the United States.
What is the country code for a 312 number?
Numbers with North American area codes use the country calling code +1.