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Phone Directory 303-428 Detail

State Major City Time Zone
Colorado Denver Mountain

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Example: (303) 428-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
303-428 Denver, CO Qwest Corporation Adams Landline 02/04/1994

Other Series For Prefixes

303-4280###
303-4281###
303-4282###
303-4283###
303-4284###
303-4285###
303-4286###
303-4287###
303-4288###
303-4289###