Area code 630 serves the western suburbs of Chicago, Illinois, including cities like Naperville, Wheaton, and Downers Grove. Created in 1996 from a split of 708, it was later overlaid with 331, requiring ten-digit dialing. The region is known for its affluent communities, corporate headquarters, and proximity to Chicago’s urban core. 630 has become a key identifier in Chicagoland’s suburban landscape, balancing residential charm with economic vitality.