Area code 708 covers western and southern Cook County and eastern and southern Will County in Illinois. Area code 708 was split off from area code 312 in 1989, and once covered all of the suburbs of Chicago. In 1996, area code 847 and area code 630 were broken off of 708. Area code 464 is being reserved as an overlay area code for 708 to provide additional numbering options for this area.
