City of Oak Brook


815 Area code: Oak Brook, DuPage - Landline

Directory Numbers

How to dial a U.S. number internationally:

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  • Dial the 10-digit phone number (area code + local number).

  • 8153490000 | +1 815-349-0000 Illinois U.S.A.
  • 8153490001 | +1 815-349-0001 Illinois U.S.A.
  • 8153490002 | +1 815-349-0002 Illinois U.S.A.
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