City of Oak Brook


773 Area code: Oak Brook, DuPage - 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).

  • 7734552400 | +1 773-455-2400 Illinois U.S.A.
  • 7734552401 | +1 773-455-2401 Illinois U.S.A.
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