CitysDirectory

City of Herndon

240 Area code: Herndon, Fairfax - Landline

Directory Numbers

How to dial a U.S. number internationally:

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  • Dial the U.S. country code (+1).
  • Dial the 10-digit phone number (area code + local number).

  • 2404500000 | +1 240-450-0000 Maryland U.S.A.
  • 2404500001 | +1 240-450-0001 Maryland U.S.A.
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  • 2404500099 | +1 240-450-0099 Maryland U.S.A.

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    e.g. 111-222-3333

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