Area code 331
Area code 331 is a telephone area code in the North American Numbering Plan. It serves Illinois, the United States.
- 331area code
- ILIllinois
- UScountry
- 7-Oct-07in service
How to dial a 331 number
From within the United States and Canada, dial 1, then 331, then the seven-digit number. From another country, dial your international access code, then +1 331 and the seven-digit number.
Area code 331 covers the same territory as 630. When several area codes share one area like this, it is called an overlay.
Other area codes in Illinois
217, 224, 309, 312, 447, 464, 618, 630, 708, 730, 773, 779, 815, 847, 861, 872
Frequently asked questions
Where is area code 331?
Area code 331 serves Illinois, the United States.
What is the country code for a 331 number?
Numbers with North American area codes use the country calling code +1.