630
Naperville
Central Time
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The 630 area is a corporate and technology corridor along I-88, with finance, insurance, IT, healthcare and manufacturing employers, and Fermilab in Batavia.
Chicago's western suburbs: most of DuPage County and parts of Kane, Will and Cook counties.
Cities include Naperville, Aurora, Wheaton, Downers Grove, Lombard, Elmhurst, Addison, Bolingbrook, Glen Ellyn, Lisle, Oak Brook, St. Charles, Batavia, Geneva, Woodridge and Yorkville. For a 630 number in Chicago's western suburbs, Retell's Chicago answering service can pick up calls day or night.
Area code 630 was created on August 3, 1996, in a split from 708. Area code 331 was added as an overlay on October 7, 2007, so both codes serve the same area and every local call needs 10-digit dialing.
Aurora, the second-largest city in Illinois after Chicago, is in the 630 area.
