630 Area Code
Western suburban Chicago, Illinois
Area code 630 is located in Western suburban Chicago, Illinois. It covers Aurora, Naperville, and surrounding areas in the Central time zone (UTC-6). Administered by NANPA.
Where is area code 630?
Area code 630 is located in Western suburban Chicago, Illinois. It covers Aurora, Naperville, and surrounding areas in the Central time zone (UTC-6).
Area code 630 is overlaid by area code 331. Both codes serve the same geographic region and require 10-digit dialing for local calls.
Cities Covered by Area Code 630
Area code 630 primarily serves the Western suburban Chicago area of Illinois. The exact coverage includes Aurora, Naperville, and Elgin, along with surrounding communities and suburbs.
Time Zone
Central Time — UTC-6
Area code 630 operates in the Central Time Zone. When calling 630 numbers from a different time zone, be sure to account for the time difference to reach people during business hours.
About Area Code 630
Area code 630 was introduced in 1996 as a geographic area code serving Western suburban Chicago, Illinois. As demand for phone numbers grew, overlay code 331 was added to the same region, requiring 10-digit dialing for local calls. Area codes are administered by NANPA (North American Numbering Plan Administration), the organization responsible for managing phone number resources in the US and Canada.