Elburn, IL is currently using an area code overlay in which area codes 331 and 630 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary because two different homes in the same geographic area can have the same seven digit phone number but each would have a different area code. The area code overlay which is in use today was put into service on October 7, 2007 when area code 331 was created as an overlay of area code 630. Area code 630 was put into service in 1996.
In addition to Elburn, IL area codes 331 and 630 serve many of the western suburbs of Chicago including the cities and communities of Aurora, Bartlett, Batavia, Bensenville, Bloomingdale, Bolingbrook, Carol Stream, Darien, Downers Grove, Elmhurst, Glen Ellyn, Glendale Heights, Hanover Park, Lisle, Lombard, Naperville, Roselle, St. Charles, Streamwood, Villa Park, West Chicago, Westmont, Wheaton and Woodridge in addition to many smaller communities within the area codes 331 and 630 service area.
Elburn, IL is located in Kane County and observes the Central Time Zone.