The U.S. state of Illinois is divided into ten distinct geographic numbering plan areas in the North American Numbering Plan (NANP), which are assigned a total of seventeen area codes . When the 86 original North American area codes where established in 1947, all of the Chicago metropolitan area was located in numbering plan area 312, the rest of northern Illinois was 815, central Illinois was 217, and southern Illinois was 618.
All NPAs within Illinois In 1954, the 217 and 618 numbering plan areas were slightly remapped, and in 1957, area code 815 was split for the assignment of area code 309 to western central Illinois. No further changes took place for 33 years.
More information Area code, Year created ...
Area code Year Parent Overlay Numbering plan area
312 1947 – 312/872 Central city area of Chicago , including the Chicago Loop and the Near North Side
773 1996 312 773/872 Chicago area, exclusive of NPA 312
872 2009 312 312/872 City of Chicago
773 773/872
708 1989 312 708/464 South suburbs and inner west suburbs of Chicago, including the Chicago Southland and most west and south suburbs in Cook County including Melrose Park , Norridge , Oak Park , Oak Lawn , Chicago Heights , and Orland Park .
464 2022 708
630 1996 708 331/630 West suburbs of Chicago in DuPage County and Kane County including Wheaton , Naperville , and Aurora
331 2007 630
847 1996 708 224/847 North and northwest suburbs of Chicago including all of Lake County , part of McHenry County , northern Cook County, and northeastern Kane County . The NPA includes Evanston , Des Plaines , Waukegan , and most of Elgin .
224 2002 847
815 1947 – 779/815 Northern Illinois outside of the immediate Chicago area including Joliet , Kankakee , LaSalle , DeKalb , and Rockford
779 2007 815
217 1947 – 217/447 Central Illinois, including the region running west from the Illinois-Indiana border through Danville , Effingham , Champaign–Urbana , Decatur , Springfield , Quincy until Illinois' western border with Missouri and Iowa
447 2021 217
309 1957 217 309/861 Central-Western Illinois including Bloomington–Normal , Peoria , and all the way west to the Illinois part of the Quad Cities including Moline , and Rock Island
815
861 2023 309
618 1947 – 618/730 Southern Illinois, including Carbondale and most of the Metro East region of St. Louis suburbs in Illinois
1954 217
730 2023 618
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