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NDC: 203

This is the National Destination Code(NDC):203 page list. Its detail is as below.
Area code 203 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 Connecticut. In 1995, area code 860 was created as an overlay to area code 203. In 2009, area code 475 was created as an overlay to area code 203. Currently, the largest city it serves is Bridgeport, CT, and it overlaps coverage areas with area code 475.
Prefix State Primary city Usage Carrier
(203) 302- Connecticut Greenwich Landline Teleport Communications Group - NY
(203) 303- Connecticut Wallingford Landline Teleport Communications America
(203) 304- Connecticut Newtown Landline Teleport Communications America
(203) 305- Connecticut Derby Wireless New Cingular Wireless PCS - DC
(203) 306- Connecticut Milford Landline Choice One Communications
(203) 307- Connecticut Fairfield Landline Brooks Fiber Communications Of Connecticut Inc-ct
(203) 308- Connecticut Derby Wireless Cellco Partnership DBA Verizon Wireless
(203) 309- Connecticut New Haven Wireless Sprint Spectrum L.p.
(203) 310- Connecticut New Canaan Landline Brooks Fiber Communications Of Connecticut Inc-ct
(203) 312- Connecticut Danbury Landline Southern New England Telephone Co.
(203) 313- Connecticut Danbury Wireless Cellco Partnership DBA Verizon Wireless
(203) 314- Connecticut New Haven Wireless Cellco Partnership DBA Verizon Wireless
(203) 315- Connecticut Branford Landline Southern New England Telephone Co.
(203) 316- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 317- Connecticut Meriden Landline Southern New England Telephone Co.
(203) 318- Connecticut Madison Landline Southern New England Telephone Co.
(203) 319- Connecticut Fairfield Landline Southern New England Telephone Co.
(203) 320- Connecticut Darien Landline Brooks Fiber Communications Of Connecticut Inc-ct
(203) 321- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 322- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 323- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 324- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 325- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 326- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 327- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 328- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 329- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 330- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 331- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 332- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 333- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 334- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 335- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 336- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 337- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 338- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 339- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 340- Connecticut Greenwich Landline Cablevision Lightpath
(203) 341- Connecticut Westport Landline Southern New England Telephone Co.
(203) 342- Connecticut Bridgeport Wireless Usa Mobility Wireless
(203) 343- Connecticut Derby Wireless New Cingular Wireless PCS - DC
(203) 344- Connecticut Old Greenwich Landline Cablevision Lightpath
(203) 345- Connecticut Bridgeport Landline Cablevision Lightpath
(203) 346- Connecticut Waterbury Landline Southern New England Telephone Co.
(203) 347- Connecticut Greenwich Landline Level 3 Communications
(203) 348- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 349- Connecticut Westport Landline Teleport Communications America
(203) 350- Connecticut Madison Landline Teleport Communications America
(203) 351- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 352- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 353- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 354- Connecticut Norwalk Landline Cablevision Lightpath
(203) 355- Connecticut Stamford Landline Cablevision Lightpath
(203) 356- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 357- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 358- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 359- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 360- Connecticut Bridgeport Wireless Metro PCS
(203) 361- Connecticut New Haven Landline Level 3 Communications
(203) 362- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 363- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 364- Connecticut Newtown Landline Southern New England Telephone Co.
(203) 365- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 366- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 367- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 368- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 369- Connecticut Old Greenwich Landline Brooks Fiber Communications Of Connecticut Inc-ct
(203) 370- Connecticut New Haven Wireless American Messaging (am)
(203) 371- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 372- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 373- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 374- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 375- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 376- Connecticut New Haven Wireless Cellco Partnership DBA Verizon Wireless
(203) 377- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 378- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 379- Connecticut Meriden Landline Southern New England Telephone Co.
(203) 380- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 381- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 382- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 383- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 384- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 385- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 386- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 387- Connecticut New Haven Landline Southern New England Telephone Co.
(203) 388- Connecticut Stamford Landline Brooks Fiber Communications Of Connecticut Inc-ct
(203) 389- Connecticut New Haven Landline Southern New England Telephone Co.
(203) 390- Connecticut New Haven Wireless Usa Mobility Wireless
(203) 391- Connecticut Stamford Landline Brooks Fiber Communications Of Connecticut Inc-ct
(203) 392- Connecticut New Haven Landline Southern New England Telephone Co.
(203) 393- Connecticut New Haven Landline Southern New England Telephone Co.
(203) 394- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 395- Connecticut Bridgeport Wireless Sprint Spectrum L.p.
(203) 396- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 397- Connecticut New Haven Landline Southern New England Telephone Co.
(203) 398- Connecticut Norwalk Wireless Usa Mobility Wireless
(203) 399- Connecticut Stamford Landline Brooks Fiber Communications Of Connecticut Inc-ct
(203) 400- Connecticut Trumbull Wireless New Cingular Wireless PCS - DC
(203) 401- Connecticut New Haven Landline Southern New England Telephone Co.
(203) 402- Connecticut Huntington Landline Southern New England Telephone Co.