About Area Code 630
- Region Code
- 630
- City
- Aurora
- State
- Illinois
- Largest City
- Aurora
- Time Zone
- Central Time
Illinois
(630) Area Code 630 — Aurora, Illinois
630 Area Code – Aurora, Illinois: Location, Time Zone & History
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Map of Area Code 630
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History & Cultural Notes
Area code 630 dates to August 3, 1996, when it was carved out of area code 708 in a three-way split that also created 847: 708 stayed with Chicago's southern suburbs, 847 took the northern suburbs, and 630 was assigned to the western suburbs centered on DuPage County, with portions of Cook, Kane, Will, and Kendall counties. As demand continued to climb, area code 331 was introduced on October 7, 2007 as an all-services overlay of 630, and ten-digit dialing became mandatory across both codes from that date.
The territory covered by 630/331 includes Aurora, Illinois's second-most populous city after Chicago with 180,542 residents at the 2020 census, and Naperville, the state's fourth-most populous city at 149,540 residents and home to major employers including Edward Hospital, Nokia, and BP America. Wheaton, Downers Grove, and Bolingbrook are also served within this numbering plan area.
Beyond its corporate and healthcare presence, the region is home to Fermi National Accelerator Laboratory in Batavia, giving the 630 area a distinctive tie to scientific research alongside its suburban business and higher-education base.