Illinois area codes
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Illinois area codes

217Illinois (Champaign, Decatur, Urbana, Springfield and central Illinois) More information at: Area Code 217 Phone Number Blocks
224Illinois (Waukegan, Des Plaines, northwest Chicago suburbs and northeastern Illinois, overlays with 847) More information at: Area Code 224 Phone Number Blocks
309Illinois (Peoria, Moline, Rock Island, Galesburg and central western Illinois) More information at: Area Code 309 Phone Number Blocks
312Illinois (downtown central Chicago area) More information at: Area Code 312 Phone Number Blocks
331Illinois (West Suburban Chicago, overlays 630) More information at: Area Code 331 Phone Number Blocks
447Illinois More information at: Area Code 447 Phone Number Blocks
464Illinois Overlay of Area code 708 More information at: Area Code 464 Phone Number Blocks
618Illinois (Alton, Belleville, Carbondale, Centralia, Mount Vernon and southern Illinois) More information at: Area Code 618 Phone Number Blocks
630Illinois (Aurora, Naperville, and other Western Chicago suburbs, overlays with 331) More information at: Area Code 630 Phone Number Blocks
708Illinois (Chicago Heights, Tinley Park, Cicero, Oak Forest, Oak Park, Berwyn, and southern and inner western Chicago suburbs) More information at: Area Code 708 Phone Number Blocks
730Illinois Overlay of Area code 618 More information at: Area Code 730 Phone Number Blocks
773Illinois (City of Chicago, excluding downtown; see also 312) More information at: Area Code 773 Phone Number Blocks
779Illinois (Crystal Lake, Rockford, Joliet, and other outlying suburbs of Chicago; It overlays with 815) More information at: Area Code 779 Phone Number Blocks
815Illinois (La Salle, De Kalb, Rockford, Freeport and northern Illinois including parts of the Chicago area such as Joliet, Plainfield and Crystal Lake, and is overlaid by 779) More information at: Area Code 815 Phone Number Blocks
847Illinois (Arlington Heights, Buffalo Grove, Wauconda, Waukegan, Des Plaines, northwest Chicago suburbs and northeastern Illinois, and is overlaid by 224) More information at: Area Code 847 Phone Number Blocks
872Illinois This Area code is scheduled to provide numbering relief to Area code 312 but no date has been assigned for this to go into effect. More information at: Area Code 872 Phone Number Blocks