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Phone Directory 303-991 Detail

State Major City Time Zone
Colorado Denver Mountain

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Example: (303) 991-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
303-991 Denver, CO Xo Colorado Jefferson Landline 08/14/1998

Other Series For Prefixes

303-9910###
303-9911###
303-9912###
303-9913###
303-9914###
303-9915###
303-9916###
303-9917###
303-9918###
303-9919###