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Phone Directory 303-978 Detail

State Major City Time Zone
Colorado Denver Mountain

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Example: (303) 978-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
303-978 Denver, CO Qwest Corporation Jefferson Landline 02/04/1994

Other Series For Prefixes

303-9780###
303-9781###
303-9782###
303-9783###
303-9784###
303-9785###
303-9786###
303-9787###
303-9788###
303-9789###