Area Codes in Illinois
17 active area codes · United States · Central Time
Illinois has 17 active area codes in the North American Numbering Plan: 217, 224, 309, 312, 331, 447, 464, 618, 630, 708, 730, 773, 779, 815, 847, 861, 872. All area codes in Illinois observe Central Time.
17
Area Codes
1
Time Zone
17
Overlay Codes
217
Springfield
Overlay
Central
224
Elgin
Overlay
Central
309
Peoria
Overlay
Central
312
Chicago Zone 01-Calumet
Overlay
Central
331
Aurora
Overlay
Central
447
Jacksonville
Overlay
Central
464
Cicero
Overlay
Central
618
Granite City
Overlay
Central
630
Aurora
Overlay
Central
708
Cicero
Overlay
Central
730
O'Fallon
Overlay
Central
773
Chicago Zone 02-Edgewater
Overlay
Central
779
Rockford
Overlay
Central
815
Rockford
Overlay
Central
847
Elgin
Overlay
Central
861
Overlay
Central
872
Chicago Zone 06-Kedzie
Overlay
Central
About Illinois Area Codes
Illinois currently has 17 active area codes in the North American Numbering Plan: 217, 224, 309, 312, 331, 447, 464, 618, 630, 708, 730, 773, 779, 815, 847, 861, 872. These operate in the Central Time time zone.