Area Codes Phone Directory 720-399

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State	Major City	Time Zone
Colorado	Denver	Mountain

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Example: (720) 399-5555 or 2012145555

Prefix	Primary City	Company	County	Usage	Introduced
720-399	Denver, CO	Level 3 Communications	Denver	Landline	05/06/2011

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720-3990###

720-3991###

720-3992###

720-3993###

720-3994###

720-3995###

720-3996###

720-3997###

720-3998###

720-3999###