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NDC: 303

This is the National Destination Code(NDC):303 page list. Its detail is as below.
Area code 303 is one of the original 86 area codes created by AT&T and the Bell System in 1947. It originally served the entire state of Colorado. In 1995, area code 303 was split, and some of the phone numbers had to be updated to area code 970 on that date. In 1998, area code 720 was created as an overlay to area code 303. Currently, the largest city it serves is Denver, CO, and it overlaps coverage areas with area code 720.
Prefix State Primary city Usage Carrier
(303) 301- Colorado Denver Landline Icg Telecom Group
(303) 302- Colorado Denver Landline Xo Colorado
(303) 304- Colorado Fort Lupton Wireless New Cingular Wireless PCS
(303) 305- Colorado Denver Landline Mcimetro Access Transmission Services LLC
(303) 306- Colorado Aurora Landline Qwest Corporation
(303) 307- Colorado Denver Landline Qwest Corporation
(303) 308- Colorado Denver Landline Qwest Corporation
(303) 309- Colorado Denver Landline Global Crossing Local Services-co
(303) 310- Colorado Denver Wireless Contact Paging Of Colorado
(303) 312- Colorado Denver Landline Qwest Corporation
(303) 313- Colorado Denver Landline Qwest Corporation
(303) 314- Colorado Denver Landline Qwest Corporation
(303) 315- Colorado Denver Landline Qwest Corporation
(303) 316- Colorado Denver Landline Qwest Corporation
(303) 317- Colorado Aurora Landline Qwest Corporation
(303) 318- Colorado Denver Landline Qwest Corporation
(303) 319- Colorado Denver Wireless Elbert County Wireless
(303) 320- Colorado Denver Landline Qwest Corporation
(303) 321- Colorado Denver Landline Qwest Corporation
(303) 322- Colorado Denver Landline Qwest Corporation
(303) 323- Colorado Denver Landline Mcimetro Access Transmission Services LLC
(303) 324- Colorado Denver Wireless New Cingular Wireless PCS
(303) 325- Colorado Denver Landline Icg Telecom Group
(303) 326- Colorado Aurora Landline Qwest Corporation
(303) 327- Colorado Denver Landline Icg Telecom Group
(303) 328- Colorado Denver Landline Mcimetro Access Transmission Services LLC
(303) 329- Colorado Denver Landline Qwest Corporation
(303) 330- Colorado Denver Landline 360networks (usa) Inc.
(303) 331- Colorado Denver Landline Qwest Corporation
(303) 332- Colorado Denver Wireless T-mobile Usa
(303) 333- Colorado Denver Landline Qwest Corporation
(303) 334- Colorado Denver Landline Mcimetro Access Transmission Services LLC
(303) 335- Colorado Denver Landline Cellco Partnership DBA Verizon Wireless
(303) 336- Colorado Denver Landline Qwest Corporation
(303) 337- Colorado Aurora Landline Qwest Corporation
(303) 338- Colorado Aurora Landline Qwest Corporation
(303) 339- Colorado Denver Landline Cbeyond Communications
(303) 340- Colorado Aurora Landline Qwest Corporation
(303) 341- Colorado Aurora Landline Qwest Corporation
(303) 342- Colorado Aurora Landline Qwest Corporation
(303) 343- Colorado Aurora Landline Qwest Corporation
(303) 344- Colorado Aurora Landline Qwest Corporation
(303) 345- Colorado Denver Landline Icg Telecom Group
(303) 346- Colorado Littleton Landline Qwest Corporation
(303) 347- Colorado Denver Landline Qwest Corporation
(303) 348- Colorado Aurora Landline Qwest Corporation
(303) 349- Colorado Denver Wireless Cellco Partnership DBA Verizon Wireless
(303) 350- Colorado Denver Landline New Cingular Wireless PCS
(303) 351- Colorado Keenesburg Landline 360networks (usa) Inc.
(303) 352- Colorado Denver Landline Qwest Corporation
(303) 353- Colorado Denver Landline Comcast Phone Of Colorado
(303) 354- Colorado Denver Landline Teleport Communications America
(303) 355- Colorado Denver Landline Qwest Corporation
(303) 356- Colorado Denver Wireless Sprint Spectrum L.p.
(303) 357- Colorado Denver Landline Mcimetro Access Transmission Services LLC
(303) 358- Colorado Denver Wireless Cellco Partnership DBA Verizon Wireless
(303) 359- Colorado Denver Wireless T-mobile Usa
(303) 360- Colorado Aurora Landline Qwest Corporation
(303) 361- Colorado Aurora Landline Qwest Corporation
(303) 362- Colorado Denver Landline Teleport Communications America
(303) 363- Colorado Aurora Landline Qwest Corporation
(303) 364- Colorado Aurora Landline Qwest Corporation
(303) 365- Colorado Aurora Landline Qwest Corporation
(303) 366- Colorado Aurora Landline Qwest Corporation
(303) 367- Colorado Aurora Landline Qwest Corporation
(303) 368- Colorado Aurora Landline Qwest Corporation
(303) 369- Colorado Aurora Landline Qwest Corporation
(303) 370- Colorado Denver Landline Qwest Corporation
(303) 371- Colorado Denver Landline Qwest Corporation
(303) 372- Colorado Denver Landline Qwest Corporation
(303) 373- Colorado Denver Landline Qwest Corporation
(303) 374- Colorado Denver Landline Teleport Communications America
(303) 375- Colorado Denver Landline Qwest Corporation
(303) 376- Colorado Denver Landline Icg Telecom Group
(303) 377- Colorado Denver Landline Qwest Corporation
(303) 378- Colorado Denver Wireless New Cingular Wireless PCS
(303) 379- Colorado Denver Landline Teleport Communications America
(303) 380- Colorado Denver Landline Qwest Corporation
(303) 381- Colorado Denver Landline Icg Telecom Group
(303) 382- Colorado Denver Landline Qwest Corporation
(303) 383- Colorado Denver Landline Qwest Corporation
(303) 384- Colorado Golden Landline Qwest Corporation
(303) 385- Colorado Denver Landline Icg Telecom Group
(303) 386- Colorado Denver Landline Icg Telecom Group
(303) 387- Colorado Denver Landline Mcleodusa Telecommunications Services- Co
(303) 388- Colorado Denver Landline Qwest Corporation
(303) 389- Colorado Denver Landline Qwest Corporation
(303) 390- Colorado Denver Landline Mcimetro Access Transmission Services LLC
(303) 391- Colorado Denver Landline Qwest Corporation
(303) 392- Colorado Denver Wireless Contact Paging Of Colorado
(303) 393- Colorado Denver Landline Qwest Corporation
(303) 394- Colorado Denver Landline Qwest Corporation
(303) 395- Colorado Denver Landline Global Crossing Local Services-co
(303) 396- Colorado Denver Landline Live Wire Networks
(303) 397- Colorado Denver Landline Qwest Corporation
(303) 398- Colorado Denver Landline Qwest Corporation
(303) 399- Colorado Denver Landline Qwest Corporation
(303) 400- Colorado Denver Landline Qwest Corporation
(303) 401- Colorado Denver Landline Qwest Corporation
(303) 402- Colorado Denver Landline Qwest Corporation