The area code 630 is located in Naperville, Illinois.
Area code 630 serves the western Chicago suburbs, with a strong presence in Naperville, Illinois, and much of DuPage County, plus parts of Kane, Kendall, and Will counties. It anchors the Illinois Technology and Research Corridor along I-88, connecting offices, research labs, and universities across the region. Landmarks in the 630 area include the Naperville Riverwalk, The Morton Arboretum in Lisle, and major research centers like Fermilab in Batavia and Argonne National Laboratory near Lemont. The area uses the Central Time Zone (CST/CDT).
"Area code 630 was created in 1996 as a split from 708." — North American Numbering Plan Administration (NANPA)
Major communities with 630 phone numbers include:
Area code 630 is overlaid by 331, so new phone numbers may use either code, and 10-digit dialing is standard for local calls. If you see a call from a 630 phone number, it most often comes from the western Chicago metro area, especially around Naperville and nearby suburbs. The mix of historic downtowns, corporate campuses, and nature sites makes 630 a hub for both business and community life. For everyday use, this overlay means plenty of number availability while keeping local calling within the same region.