City of Frederick


301 Area code: Frederick, Frederick - 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).

  • 3014189900 | +1 301-418-9900 Maryland U.S.A.
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  • 3014189999 | +1 301-418-9999 Maryland U.S.A.