Area code 630 serves the western suburbs of Chicago, including cities such as Naperville, Wheaton, Downers Grove, and Lombard. It was created in 1996 as a split from area code 708 to manage increasing demand in the fast-growing suburban corridor. In 2007, area code 331 was added as an overlay, requiring ten-digit dialing throughout the region. The 630 area is known for its strong commercial base, family-oriented neighborhoods, and access to major highways and commuter rail lines. It continues to be a preferred area for businesses and residents seeking proximity to Chicago with suburban amenities. 630 remains a key part of the telecommunications infrastructure in northeastern Illinois.