City of Boulder


720 Area code: Boulder, Boulder - 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).

  • 7205615100 | +1 720-561-5100 Colorado U.S.A.
  • 7205615101 | +1 720-561-5101 Colorado U.S.A.
  • 7205615102 | +1 720-561-5102 Colorado U.S.A.
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  • 7205615159 | +1 720-561-5159 Colorado U.S.A.
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  • 7205615181 | +1 720-561-5181 Colorado U.S.A.
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