City of Chicago


312 Area code: Chicago, Cook - Landline

Directory Numbers

How to dial a U.S. number internationally:

  • Start with your country's exit code (e.g., 011 for the U.S. or Canada).
  • Dial the U.S. country code (+1).
  • Dial the 10-digit phone number (area code + local number).

  • 3128392300 | +1 312-839-2300 Illinois U.S.A.
  • 3128392301 | +1 312-839-2301 Illinois U.S.A.
  • 3128392302 | +1 312-839-2302 Illinois U.S.A.
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  • 3128392374 | +1 312-839-2374 Illinois U.S.A.
  • 3128392375 | +1 312-839-2375 Illinois U.S.A.
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