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Phone Directory 303-400 Detail

State Major City Time Zone
Colorado Denver Mountain

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
303-400 Denver, CO Qwest Corporation Jefferson Landline 11/20/1998

Other Series For Prefixes

303-4000###
303-4001###
303-4002###
303-4003###
303-4004###
303-4005###
303-4006###
303-4007###
303-4008###
303-4009###