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Phone Directory 303-399 Detail

State Major City Time Zone
Colorado Denver Mountain

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Example: (303) 399-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
303-399 Denver, CO Qwest Corporation Denver Landline 02/04/1994

Other Series For Prefixes

303-3990###
303-3991###
303-3992###
303-3993###
303-3994###
303-3995###
303-3996###
303-3997###
303-3998###
303-3999###