Illinois · Central Time
630 Area Code
Area code 630 is in Illinois, serving western Chicago suburbs in DuPage, Kane, Kendall and northern Will counties. It is in the Central Time zone. It shares its territory with overlay code 331, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 630 area code?
630 is a Illinois area code covering western Chicago suburbs in DuPage, Kane, Kendall and northern Will counties. In the wider directory it sits in the Midwest region.
Cities in the 630 area code
- Aurora
- Naperville
- Bolingbrook
- Wheaton
- Downers Grove
- Elmhurst
- Lombard
- Carol Stream
- St. Charles
- Glendale Heights
- Oswego
- Batavia
- Woodridge
- Addison
Counties served by 630
DuPage County, Kane County, Kendall County, Will County and Cook County.
630 overlay codes and dialing
The 630 territory is covered by an overlay of 2 area codes: 331, 630. All of them serve the same geographic area, and the original code is 630. Because more than one code covers the same ground, 10-digit dialing is mandatory — you must dial the area code for every local call. New phone lines may be assigned any of these codes.
History of the 630 area code
630 went into service on August 3, 1996, created when it was split from 708. It serves Aurora and the surrounding part of Illinois, and today shares its territory with overlay code 331. For how codes are created, split, and overlaid, see how area codes work.
Is 630 a scam or spam risk?
630 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 630 number on your screen is no guarantee the caller is in Aurora, IL or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Other Illinois area codes
Explore more
See every code in Illinois, compare codes across the Midwest region, or view all Central Time codes. You can also browse the 6XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
630 area code FAQ
Where is the 630 area code?
The 630 area code is in Illinois, covering western Chicago suburbs in DuPage, Kane, Kendall and northern Will counties, in the Midwest region.
What cities are in the 630 area code?
Cities in the 630 area code include Aurora, Naperville, Bolingbrook, Wheaton, Downers Grove, Elmhurst, Lombard, Carol Stream, St. Charles and Glendale Heights.
What time zone is 630 in?
630 is in the Central Time zone.
What is the overlay for the 630 area code?
630 shares its territory with 331. Both codes (331, 630) serve the same area, so 10-digit dialing is required for every call.
When did the 630 area code start?
630 went into service on August 3, 1996.
Do I have to dial 10 digits for 630?
Yes. Because 630 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 630 a toll-free or premium code?
No. 630 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.