Area Code 331
Area Code 331 is in Illinois
(217 and 447) - (224 and 847)
(309 and 861) - (312 and 872)
(331 and 630) - (464 and 708)
(618 and 730) - (773 and 872)
(779 and 815)
Area Code 331 History:
Area code 331 was officially put into service. Area code 331 is an overlay of area code 630.
Counties in Illinois within area code 331 include:
DuPage County, Kane County, Cook County, Will County, and Kendall County.
Major cities or places in Illinois within area code 331 include:
Area codes 331 and 630 serve many of the western suburbs of Chicago including the cities and communities of Aurora, Bartlett, Batavia, Bensenville, Bloomingdale, Bolingbrook, Carol Stream, Darien, Downers Grove, Elmhurst, Glen Ellyn, Glendale Heights, Hanover Park, Lisle, Lombard, Naperville, Roselle, St. Charles, Streamwood, Villa Park, West Chicago, Westmont, Wheaton and Woodridge in addition to many smaller communities within the area codes 331 and 630 service area.