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Area codes 630 and 331 are telephone area codes in the North American Numbering Plan (NANP) for portions of Chicago 's near and far western suburbs, including the majority of DuPage County, Illinois.
Jul 11, 2011 · Area code 331 serves the state of Illinois. This area code was assigned on July 23rd, 1999. On October 7th, 2007 it went into service. 331 is a General Purpose Code. 331 service area does overlap with 630 area codes. Dialing pattern for local calls within the same NPA (area code) is 1+10D.
Jun 1, 2024 · 331 Area Code located in Illinois, including 31 cities, 5 counties, 1 time zone, map, Census demographics, and 183 active prefixes.
Area code 630 serves the state of Illinois. This area code was assigned on August 9th, 1994. On August 3rd, 1996 it went into service. 630 is a General Purpose Code. 630 service area does overlap with 331 area codes. Dialing pattern for local calls within the same NPA (area code) is 1+10D.
5 days ago · Area code 331 is assigned for use in Illinois since Oct 07, 2007. This area code originated from the 630 area code previously by means of area code split or overlay. View all phone prefixes used in area code 331 or other area codes in Illinois .
Area code 331 is located in Illinois and covers Aurora, Naperville, Bolingbrook, and Wheaton. It is an overlay for area code 630 and serves the same area.
About area code 630: location, common spam callers, related area codes, and more. Includes 630 reverse phone lookup to identify spam callers.
