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NDC: 312

This is the National Destination Code(NDC):312 page list. Its detail is as below.
Area code 312 is one of the original 86 area codes created by AT&T and the Bell System in 1947. It originally served the Chicago metropolitan area. In 1996, area code 773 was created as an overlay to area code 312. In 2009, area code 872 was created as an overlay to area code 312. To avoid exhausting all possible phone numbers in this area code, relief planning has begun. Currently, the largest city it serves is Chicago, IL, and it overlaps coverage areas with area code 872.
Prefix State Primary city Usage Carrier
(312) 412- Illinois Wheeling Wireless New Cingular Wireless PCS
(312) 413- Illinois Chicago Landline Ameritech Illinois
(312) 415- Illinois Chicago Wireless Cellco Partnership DBA Verizon Wireless
(312) 416- Illinois Chicago Landline Mci Worldcom Communications
(312) 417- Illinois Chicago Wireless Ameritech Illinois
(312) 418- Illinois Chicago Wireless Usa Mobility Wireless
(312) 419- Illinois Chicago Landline Ameritech Illinois
(312) 420- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 421- Illinois Chicago Landline Ameritech Illinois
(312) 422- Illinois Chicago Landline Ameritech Illinois
(312) 423- Illinois Chicago Landline Broadwing Communications
(312) 424- Illinois Chicago Landline Ameritech Illinois
(312) 425- Illinois Chicago Landline Ameritech Illinois
(312) 426- Illinois Chicago Wireless Usa Mobility Wireless
(312) 427- Illinois Chicago Landline Ameritech Illinois
(312) 428- Illinois Chicago Wireless Level 3 Communications
(312) 429- Illinois Chicago Landline Global Crossing Local Services-il
(312) 430- Illinois Chicago Landline Ameritech Illinois
(312) 431- Illinois Chicago Landline Ameritech Illinois
(312) 432- Illinois Chicago Landline Ameritech Illinois
(312) 433- Illinois Chicago Landline Ameritech Illinois
(312) 434- Illinois Chicago Wireless Sprint Spectrum L.p.
(312) 435- Illinois Chicago Landline Ameritech Illinois
(312) 436- Illinois Chicago Landline Ameritech Illinois
(312) 437- Illinois Chicago Wireless Sprint Spectrum L.p.
(312) 440- Illinois Chicago Landline Ameritech Illinois
(312) 441- Illinois Chicago Landline Ameritech Illinois
(312) 442- Illinois Chicago Landline Ameritech Illinois
(312) 443- Illinois Chicago Landline Ameritech Illinois
(312) 444- Illinois Chicago Landline Ameritech Illinois
(312) 445- Illinois Chicago Landline Ameritech Illinois
(312) 446- Illinois Chicago Wireless Sprint Spectrum L.p.
(312) 447- Illinois Chicago Landline Ameritech Illinois
(312) 448- Illinois Chicago Wireless Cellco Partnership DBA Verizon Wireless
(312) 449- Illinois Chicago Wireless American Messaging (am)
(312) 450- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 451- Illinois Chicago Landline T-mobile Usa
(312) 452- Illinois Chicago Wireless American Messaging (am)
(312) 453- Illinois Chicago Landline Mci Worldcom Communications
(312) 454- Illinois Chicago Landline Ameritech Illinois
(312) 455- Illinois Chicago Landline Ameritech Illinois
(312) 456- Illinois Chicago Landline Ameritech Illinois
(312) 457- Illinois Chicago Wireless American Messaging (am)
(312) 458- Illinois Chicago Landline Ameritech Illinois
(312) 459- Illinois Chicago Wireless T-mobile Usa
(312) 460- Illinois Chicago Landline Ameritech Illinois
(312) 461- Illinois Chicago Landline Ameritech Illinois
(312) 462- Illinois Chicago Landline Ameritech Illinois
(312) 463- Illinois Chicago Landline Ameritech Illinois
(312) 464- Illinois Chicago Landline Ameritech Illinois
(312) 465- Illinois Chicago Landline Us Xchange Of Illinois LLC DBA Choice One Comm Il
(312) 466- Illinois Chicago Landline Ameritech Illinois
(312) 467- Illinois Chicago Landline Ameritech Illinois
(312) 469- Illinois Chicago Landline Ameritech Illinois
(312) 470- Illinois Chicago Landline Mcimetro Access Transmission Services LLC
(312) 472- Illinois Chicago Landline Ameritech Illinois
(312) 473- Illinois Chicago Landline Ymax Communications Corp.
(312) 474- Illinois Chicago Landline Ameritech Illinois
(312) 475- Illinois Chicago Landline Ameritech Illinois
(312) 476- Illinois Chicago Landline Sprint Spectrum L.p.
(312) 477- Illinois Chicago Wireless Level 3 Communications
(312) 478- Illinois Chicago Landline T-mobile Usa
(312) 479- Illinois Chicago Landline AT&T Local
(312) 480- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 482- Illinois Chicago Landline Ameritech Illinois
(312) 484- Illinois Chicago Wireless Usa Mobility Wireless
(312) 485- Illinois Chicago Wireless Cellco Partnership DBA Verizon Wireless
(312) 486- Illinois Chicago Landline Mci Worldcom Communications
(312) 488- Illinois Chicago Landline Pg Telecom Of Illinois Inc.
(312) 489- Illinois Chicago Wireless Cellco Partnership DBA Verizon Wireless
(312) 490- Illinois Chicago Wireless Usa Mobility Wireless
(312) 491- Illinois Chicago Landline Ameritech Illinois
(312) 492- Illinois Chicago Landline Ameritech Illinois
(312) 493- Illinois Chicago Wireless T-mobile Usa
(312) 494- Illinois Chicago Landline Ameritech Illinois
(312) 495- Illinois Chicago Wireless Usa Mobility Wireless
(312) 496- Illinois Chicago Landline Ameritech Illinois
(312) 497- Illinois Chicago Wireless Cellco Partnership DBA Verizon Wireless
(312) 498- Illinois Chicago Wireless Sprint Spectrum L.p.
(312) 499- Illinois Chicago Landline Ameritech Illinois
(312) 501- Illinois La Grange Park Wireless Cellco Partnership DBA Verizon Wireless
(312) 502- Illinois Chicago Wireless Cellco Partnership DBA Verizon Wireless
(312) 503- Illinois Chicago Landline Broadwing Communications
(312) 504- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 505- Illinois Chicago Wireless Cellco Partnership DBA Verizon Wireless
(312) 506- Illinois Chicago Landline Cimco Communications
(312) 507- Illinois Chicago Landline Ameritech Illinois
(312) 508- Illinois Chicago Landline Peerless Network Of Illinois
(312) 509- Illinois Chicago Landline Peerless Network Of Illinois
(312) 510- Illinois Hinsdale Wireless New Cingular Wireless PCS
(312) 512- Illinois Chicago Wireless Usa Mobility Wireless
(312) 513- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 514- Illinois Chicago Wireless American Messaging (am)
(312) 515- Illinois Chicago Wireless Cellco Partnership DBA Verizon Wireless
(312) 516- Illinois Chicago Landline Ameritech Illinois
(312) 518- Illinois Wheeling Wireless New Cingular Wireless PCS
(312) 519- Illinois Chicago Wireless Cellco Partnership DBA Verizon Wireless
(312) 520- Illinois Chicago Wireless Cellco Partnership DBA Verizon Wireless
(312) 521- Illinois Chicago Landline AT&T Local
(312) 523- Illinois Chicago Wireless Sprint Spectrum L.p.