Area Code (303) Information:

State: Colorado - CO

Major Cities: Firestone, Elizabeth, Parker, Morrison, Highlands Ranch, Longmont, Erie, Bailey, Adams City, Larkspur, Lyons, Broomfield, Lafayette, Bennett, Nederland, Hudson, Black Hawk, Bow Mar, Littleton, Idaho Springs

Major Carriers: Xo Colorado, Llc, Mediaone Telecomm Corp., Dba At&t Broadband, Neutral Tandem-colorado, Llc - Co, Pac - West Telecomm, Inc. - Co, T-mobile Usa, Inc., Sprint Spectrum L.p., Blue Licenses Holding, Llc, Eastern Slope Rural Telephone Association, Inc., Cellco Partnership Dba Verizon Wireless - Co, Elbert County Wireless, Llc, Nextel Communications, Inc., Interlink Adv Svc D/b/a Forethought.net - Co, Time Warner Telecom Of Colorado Llc-co, Strasburg Telephone Co., 360networks (usa) Inc. - Co, Qwest Corporation, Falcon Broadband, Inc. - Co, Cbeyond Communications, Llc-co, Comcast Phone Of Colorado, Llc - Co, Level 3 Communications, Llc - Co