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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) 403- Connecticut Ridgefield Landline Teleport Communications America
(203) 404- Connecticut New Haven Landline Broadwing Communications
(203) 405- Connecticut Woodbury Landline Paetec Communications
(203) 406- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 407- Connecticut New Haven Landline Southern New England Telephone Co.
(203) 408- Connecticut Redding Landline AT&T Local
(203) 409- Connecticut Old Greenwich Landline Teleport Communications America
(203) 410- Connecticut New Haven Wireless Sprint Spectrum L.p.
(203) 412- Connecticut New Haven Wireless American Messaging (am)
(203) 413- Connecticut Greenwich Landline Paetec Communications - NY
(203) 414- Connecticut Bridgeport Wireless New Cingular Wireless PCS - DC
(203) 415- Connecticut New Haven Wireless New Cingular Wireless PCS - DC
(203) 416- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 417- Connecticut Danbury Wireless New Cingular Wireless PCS - DC
(203) 418- Connecticut Fairfield Landline Teleport Communications America
(203) 419- Connecticut Waterbury Landline Southern New England Telephone Co.
(203) 420- Connecticut Meriden Landline Southern New England Telephone Co.
(203) 421- Connecticut Madison Landline Southern New England Telephone Co.
(203) 422- Connecticut Greenwich Landline Verizon New York
(203) 423- Connecticut Wilton Landline Teleport Communications America
(203) 424- Connecticut Danbury Wireless Sprint Spectrum L.p.
(203) 425- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 426- Connecticut Newtown Landline Southern New England Telephone Co.
(203) 427- Connecticut Meriden Landline Mcimetro Access Transmission Services LLC
(203) 428- Connecticut Stamford Landline Brooks Fiber Communications Of Connecticut Inc-ct
(203) 429- Connecticut Stamford Landline Brooks Fiber Communications Of Connecticut Inc-ct
(203) 430- Connecticut New Haven Wireless New Cingular Wireless PCS - DC
(203) 431- Connecticut Ridgefield Landline Southern New England Telephone Co.
(203) 432- Connecticut New Haven Landline Southern New England Telephone Co.
(203) 433- Connecticut Branford Landline Comcast Phone Of Connecticut
(203) 434- Connecticut Norwalk Wireless Omnipoint Communications
(203) 435- Connecticut New Haven Wireless Omnipoint Communications
(203) 436- Connecticut New Haven Landline Southern New England Telephone Co.
(203) 437- Connecticut Waterbury Landline Brooks Fiber Communications Of Connecticut Inc-ct
(203) 438- Connecticut Ridgefield Landline Southern New England Telephone Co.
(203) 439- Connecticut Cheshire Landline Cox Connecticut Telecom
(203) 440- Connecticut Meriden Landline Cox Connecticut Telecom
(203) 441- Connecticut Wolcott Landline Teleport Communications America
(203) 442- Connecticut New Canaan Landline Teleport Communications America
(203) 443- Connecticut Meriden Landline Brooks Fiber Communications Of Connecticut Inc-ct
(203) 444- Connecticut New Haven Wireless New Cingular Wireless PCS - DC
(203) 445- Connecticut Trumbull Landline Southern New England Telephone Co.
(203) 446- Connecticut Derby Landline Teleport Communications America
(203) 447- Connecticut Huntington Landline Teleport Communications America
(203) 448- Connecticut Danbury Landline Brooks Fiber Communications Of Connecticut Inc-ct
(203) 449- Connecticut Bridgeport Wireless Sprint Spectrum L.p.
(203) 450- Connecticut Bridgeport Wireless Cellco Partnership DBA Verizon Wireless
(203) 451- Connecticut Westport Landline New Cingular Wireless PCS - DC
(203) 452- Connecticut Trumbull Landline Southern New England Telephone Co.
(203) 453- Connecticut Guilford Landline Southern New England Telephone Co.
(203) 454- Connecticut Westport Landline Southern New England Telephone Co.
(203) 455- Connecticut Bridgeport Landline Brooks Fiber Communications Of Connecticut Inc-ct
(203) 456- Connecticut Danbury Wireless Cellco Partnership DBA Verizon Wireless
(203) 457- Connecticut Guilford Landline Southern New England Telephone Co.
(203) 458- Connecticut Guilford Landline Southern New England Telephone Co.
(203) 459- Connecticut Trumbull Landline Southern New England Telephone Co.
(203) 460- Connecticut Danbury Landline AT&T Local
(203) 461- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 462- Connecticut Stamford Landline Southern New England Telephone Co.
(203) 463- Connecticut Seymour Landline Teleport Communications America
(203) 464- Connecticut New Haven Wireless Cellco Partnership DBA Verizon Wireless
(203) 465- Connecticut Waterbury Landline Southern New England Telephone Co.
(203) 466- Connecticut New Haven Landline Southern New England Telephone Co.
(203) 467- Connecticut New Haven Landline Southern New England Telephone Co.
(203) 468- Connecticut New Haven Landline Southern New England Telephone Co.
(203) 469- Connecticut New Haven Landline Southern New England Telephone Co.
(203) 470- Connecticut Danbury Wireless Cellco Partnership DBA Verizon Wireless
(203) 471- Connecticut Unknown Southern New England Telephone Co.
(203) 472- Connecticut Unknown Southern New England Telephone Co.
(203) 473- Connecticut Unknown Southern New England Telephone Co.
(203) 474- Connecticut Unknown Southern New England Telephone Co.
(203) 476- Connecticut Unknown Southern New England Telephone Co.
(203) 477- Connecticut New Haven Wireless Usa Mobility Wireless
(203) 478- Connecticut Unknown Southern New England Telephone Co.
(203) 479- Connecticut New Haven Landline Southern New England Telephone Co.
(203) 480- Connecticut Fairfield Landline Brooks Fiber Communications Of Connecticut Inc-ct
(203) 481- Connecticut Branford Landline Southern New England Telephone Co.
(203) 482- Connecticut Danbury Wireless New Cingular Wireless PCS - DC
(203) 483- Connecticut Branford Landline Southern New England Telephone Co.
(203) 484- Connecticut Northford Landline Southern New England Telephone Co.
(203) 485- Connecticut Greenwich Landline Cablevision Lightpath
(203) 486- Connecticut Southbury Landline Southern New England Telephone Co.
(203) 487- Connecticut Stamford Landline Global Crossing Local Services-ct
(203) 488- Connecticut Branford Landline Southern New England Telephone Co.
(203) 489- Connecticut Greenwich Landline Cablevision Lightpath
(203) 490- Connecticut Naugatuck Landline Teleport Communications America
(203) 491- Connecticut Newtown Landline Bandwidth.com Clec
(203) 492- Connecticut New Haven Landline Southern New England Telephone Co.
(203) 493- Connecticut Redding Landline Level 3 Communications
(203) 494- Connecticut New Haven Wireless Cellco Partnership DBA Verizon Wireless
(203) 495- Connecticut New Haven Landline Southern New England Telephone Co.
(203) 496- Connecticut Greenwich Wireless Sprint Spectrum L.p.
(203) 497- Connecticut New Haven Landline Southern New England Telephone Co.
(203) 498- Connecticut New Haven Landline Southern New England Telephone Co.
(203) 499- Connecticut New Haven Landline Southern New England Telephone Co.
(203) 500- Connecticut New Haven Wireless New Cingular Wireless PCS - DC
(203) 501- Connecticut Danbury Wireless Cellco Partnership DBA Verizon Wireless
(203) 502- Connecticut Bridgeport Landline Southern New England Telephone Co.
(203) 503- Connecticut New Haven Landline Southern New England Telephone Co.
(203) 504- Connecticut Stamford Landline Ctc Communications Corp.