State Directory

Illinois Area Codes

12 area codes • 1 time zone • 13+ cities

Active Codes
12
Time Zones
1

All Illinois Area Codes

12 total
217
Springfield, Champaign
Central Time (CT)
Est. 1947
224
Elgin, Waukegan
Central Time (CT)
Est. 2002
312
Chicago
Central Time (CT)
Est. 1947
331
Aurora, Naperville
Central Time (CT)
Est. 2007
618
East St. Louis
Central Time (CT)
Est. 1947
630
Aurora, Naperville
Central Time (CT)
Est. 1996
708
Cicero, Oak Lawn
Central Time (CT)
Est. 1989
773
Chicago
Central Time (CT)
Est. 1996
779
Rockford
Central Time (CT)
Est. 2007
815
Rockford, Joliet
Central Time (CT)
Est. 1947
847
Elgin, Schaumburg
Central Time (CT)
Est. 1996
872
Chicago
Central Time (CT)
Est. 2009

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Codes by Time Zone

Central Time (CT)

12 codes
217224312331618630708773779815847872

About Illinois Area Codes

Illinois is served by 12 area codes, covering various cities and regions throughout the state. Each area code has its own service area and may overlap with other codes in some locations.

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Quick Facts

  • 12 active area codes in Illinois
  • Operates across 1 time zone
  • Oldest code established in 1947