Find any 331- phone number in Illinois
The 331 area code is an area code in the North American Numbering Plan (NANP), covering certain areas in northeastern Illinois. This area code was established in 2009, following the traditional methods of area code division set by the North American Numbering Plan. This plan entails splitting geographic areas along existing state or provincial borderlines.
The 331 area code serves specific areas of northeastern Illinois, as well as a few other nearby counties that border the designated geographic area. These areas comprise much of the northern suburbs of the Chicago metropolitan area, including both small towns and large cities. Naperville, Elgin, and Downers Grove are some of the larger cities that use the 331 area code, while North Aurora, Yorkville, and Plainfield are some of the smaller towns. The 331 area code is one of the several area codes that are utilized in the state of Illinois.