 |
|
|
|
|
Chicago, Illinois Area Code |
|
|
Chicago, IL Area Codes are 312, 773, and 872 |
|
|
Chicago, IL is currently using three area codes 312, 773 and 872. Chicago, IL utilizes an area code overlay in
which area codes 312, 773 and 872 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary in Chicago because two different homes or businesses in the same geographic
area can have the same seven digit phone number but each would have a different area code.
Chicago originally utilized area code 312 which was one of the original area codes assigned to Illinois in
1947. In 1996 area code 312 was split to form area code 773. Area code 312 then served the downtown area, or inside "The Loop" and area code 773 served the remainder of the city. On November 7, 2009 area
code 872 was put into service. Area code 872 is an overlay of of both 312 and 773. |
|
|
|
|
|
Illinois Area Codes |
217, 224, 309, 312, 331, 618, 630, 708, 773, 779, 815, 847, 872 |
|
|
