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Phone Directory 303-523 Detail

State Major City Time Zone
Colorado Denver Mountain

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Example: (303) 523-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
303-523 Denver, CO T-mobile Usa Jefferson Cell Number 10/15/1996

Other Series For Prefixes

303-5230###
303-5231###
303-5232###
303-5233###
303-5234###
303-5235###
303-5236###
303-5237###
303-5238###
303-5239###