Illinois Area Code Information

Illinois Area Codes


Illinois Area Code Overlays
(847 and 224) - (815 and 779)
(630 and 331) - (312 and 872)
(773 and 872)


Illinois is currently using thirteen area codes. Illinois currently has three area codes, 447,464, and 730, which are assigned to provide numbering relief but are not yet in service. Illinois utilizes five area code overlay plans, often called an overlay complex.

Illinois originally had four area codes, 217,312,618 and 815, when the numbering system was established in 1947. It was not until ten years later in 1957 that Illinois experienced sufficient growth in population and telephone use to need an additional area code. In 1957 area code 309 was created by a split of area codes 217 and 815. These five area codes were sufficient until 1989.

Changes and History of Illinois Area Codes:

01/01/1947
Area code 217 was put into service. In 1957 area code 217 was split, along with a portion of area code 815, to form part of area code 309.

01/01/1947
Area code 312 was put into service. In 1989 Area code 312 was split to form area code 708. In 1996 area code 312 was split again to form area code 773. In 2009 area code 312 was overlaid with area code 872.





Area code 618 was put into service.

01/01/1947
Area code 815 was put into service. In 1957 area code 815 was split, along with a portion of area code 217, to form area code 309. In 2007 area code 815 was overlaid with area code 779.

01/01/1957
Area code 309 was put into service. Area code 309 was created from splits of area codes 217 and 815.

11/11/1989
Area code 708 was put into service. Then in 1996 portions of area code 708 were split to form area codes 847 and 630. Area code 464, which is not yet in service, has been proposed as an overlay of area code 708.

01/20/1996
Area code 847 was put into service. Area code 847 created from a split of area code 708. In 1998 area code 847 was overlaid with area code 224 but it was not put into service until 2002.

08/03/1996
Area code 630 was put into service. Area code 630 was created from a split of area code 708. In 2007 area code 630 was overlaid with area code 331.

10/12/1996
Area code 773 was put into service. Area code 773 was created from a split of area code 312. In 2009 area code 773 was overlaid with area code 872.

01/05/2002
Area code 224 was put into service. Area code 224 is an overlay of area code 847.

03/17/2007
Area code 779 was put into service. Area code 779 is an overlay of area code 815.

10/07/2007
Area code 331 was put into service. Area code 331 is an overlay of area code 630.

11/07/2009
Area code 872 was put into service. Area code 872 is an overlay of area codes 312 and 773.

not in service
Area code 447 proposed. Area code 447 is proposed as an overlay of area code 217 but is not yet in service.

not in service
Area code 464 proposed. Area code 464 is proposed as an overlay of area code 708 but is not yet in service.

not in service
Area code 730 proposed. Area code 730 is proposed as an overlay of area code 618 but is not yet in service.






Related pages


deepwater njvaldosta ga time zone01705 area codehow to dial to guadalajara mexicocity of hereford txwhere is the area code 866 located92805 area codescottsbluff ne time zonewhat area code is 480 in arizonatalahassee time zone209 area code citieswhere is the area code 901 locatedgermantown ohio zip codearea code 343 canadabristol tn area codetsaile azwhere is area code 209 in californiawhere is 956 area code locatedwhere is area code 953lewisville tx area code386 area code citythousand oaks municipal codearea code 559 in californialeavenworth area codesmithville virginiaarea codes 619 locationdialing to costa ricarogers ar area codebiltmore lake north carolinacedar rapids iowa time zonetime zone south bend indianagarrett ky773area codearea code 92154area code 323 canadaphone code 801st vincent abilene tx808 area codeinternational dialling code thailandedwards afb area codearea code 954 canadais 845 toll freeflorida phone area codesarea code 956 in texasarea code for la californiatime zone des moinesarea codes 209 locationpinecraft floridawhere is 580 area code locateddanville ohio zip codesetauket ny zip codecalifornia usa area codearea code of philippines manilawhat is area code 559dialling code irelandtexas area code 972684 country codenassau bahamas area codelist of states in usa with codeswhere is the area code 970humboldt tn area codegreenlee coloradoarea code for kenosha wizip code milford ma669 area code mappleasanton nebraskaal khobar telephone codewhere is telephone area code 876fremont ohio zip codewhere is area code 317 in canadabogota dialing codenovi mi area codesaint louis missouri area code