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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) 304- Illinois Hinsdale Wireless New Cingular Wireless PCS
(312) 305- Illinois Northbrook Wireless Cellco Partnership DBA Verizon Wireless
(312) 306- Illinois Chicago Landline Ameritech Illinois
(312) 307- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 308- Illinois Chicago Landline Ameritech Illinois
(312) 309- Illinois Chicago Landline Ameritech Illinois
(312) 310- Illinois Northbrook Wireless Cellco Partnership DBA Verizon Wireless
(312) 314- Illinois Hinsdale Wireless New Cingular Wireless PCS
(312) 315- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 316- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 317- Illinois Wheeling Wireless New Cingular Wireless PCS
(312) 318- Illinois La Grange Park Wireless Cellco Partnership DBA Verizon Wireless
(312) 320- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 321- Illinois Chicago Landline Ameritech Illinois
(312) 322- Illinois Chicago Landline Ameritech Illinois
(312) 323- Illinois Chicago Wireless American Messaging (am)
(312) 324- Illinois Chicago Landline Level 3 Communications
(312) 325- Illinois Chicago Landline Ameritech Illinois
(312) 326- Illinois Chicago Landline Ameritech Illinois
(312) 327- Illinois Chicago Landline Xo Illinois
(312) 328- Illinois Chicago Landline Ameritech Illinois
(312) 329- Illinois Chicago Landline Ameritech Illinois
(312) 330- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 331- Illinois Wheeling Wireless New Cingular Wireless PCS
(312) 332- Illinois Chicago Landline Ameritech Illinois
(312) 333- Illinois Chicago Wireless American Messaging (am)
(312) 334- Illinois Chicago Landline First Communications LLC
(312) 335- Illinois Chicago Landline Ameritech Illinois
(312) 336- Illinois Chicago Landline Ameritech Illinois
(312) 337- Illinois Chicago Landline Ameritech Illinois
(312) 338- Illinois Chicago Landline Ameritech Illinois
(312) 339- Illinois Chicago Wireless Cellco Partnership DBA Verizon Wireless
(312) 340- Illinois Chicago Wireless Cellco Partnership DBA Verizon Wireless
(312) 341- Illinois Chicago Landline Ameritech Illinois
(312) 342- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 343- Illinois Chicago Wireless Cellco Partnership DBA Verizon Wireless
(312) 344- Illinois Chicago Landline Ameritech Illinois
(312) 345- Illinois Chicago Landline Ameritech Illinois
(312) 346- Illinois Chicago Landline Ameritech Illinois
(312) 347- Illinois Chicago Landline Ameritech Illinois
(312) 348- Illinois Chicago Landline Neutral Tandem-illinois
(312) 349- Illinois Chicago Wireless Usa Mobility Wireless
(312) 350- Illinois Chicago Wireless Cellco Partnership DBA Verizon Wireless
(312) 351- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 352- Illinois Hinsdale Wireless New Cingular Wireless PCS
(312) 353- Illinois Chicago Landline Ameritech Illinois
(312) 354- Illinois Roselle Wireless New Cingular Wireless PCS
(312) 355- Illinois Chicago Landline Ameritech Illinois
(312) 356- Illinois Chicago Landline Ameritech Illinois
(312) 357- Illinois Chicago Landline Ameritech Illinois
(312) 359- Illinois Chicago Wireless Usa Mobility Wireless
(312) 360- Illinois Chicago Landline Ameritech Illinois
(312) 361- Illinois Chicago Landline Ameritech Illinois
(312) 362- Illinois Chicago Landline Ameritech Illinois
(312) 363- Illinois Chicago Landline Rcn Telecom Services Of Illinois
(312) 364- Illinois Chicago Landline Ameritech Illinois
(312) 365- Illinois Chicago Wireless Usa Mobility Wireless
(312) 366- Illinois La Grange Park Wireless Usa Mobility Wireless
(312) 367- Illinois La Grange Park Wireless Usa Mobility Wireless
(312) 368- Illinois Chicago Landline Ameritech Illinois
(312) 369- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 370- Illinois Chicago Wireless Usa Mobility Wireless
(312) 371- Illinois Chicago Wireless Sprint Spectrum L.p.
(312) 372- Illinois Chicago Landline Ameritech Illinois
(312) 373- Illinois Chicago Landline Broadwing Communications
(312) 374- Illinois Chicago Landline Ameritech Illinois
(312) 375- Illinois Chicago Wireless T-mobile Usa
(312) 376- Illinois Chicago Landline Cbeyond Communications
(312) 377- Illinois Chicago Landline Xo Illinois
(312) 378- Illinois Chicago Wireless Usa Mobility Wireless
(312) 379- Illinois Chicago Landline Ovation Communications Of Illinois
(312) 380- Illinois Chicago Landline Ameritech Illinois
(312) 381- Illinois Chicago Landline Ameritech Illinois
(312) 382- Illinois Chicago Landline Ameritech Illinois
(312) 384- Illinois Chicago Landline Ameritech Illinois
(312) 385- Illinois Chicago Landline Ameritech Illinois
(312) 386- Illinois Chicago Landline Ameritech Illinois
(312) 387- Illinois Chicago Wireless Usa Mobility Wireless
(312) 388- Illinois Chicago Wireless Sprint Spectrum L.p.
(312) 389- Illinois Chicago Wireless Usa Mobility Wireless
(312) 390- Illinois Chicago Wireless American Messaging (am)
(312) 391- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 393- Illinois Chicago Wireless American Messaging (am)
(312) 394- Illinois Chicago Landline Ameritech Illinois
(312) 395- Illinois Chicago Landline AT&T Local
(312) 396- Illinois Chicago Landline Ameritech Illinois
(312) 397- Illinois Chicago Landline Ameritech Illinois
(312) 398- Illinois Chicago Wireless Usa Mobility Wireless
(312) 399- Illinois Chicago Wireless Sprint Spectrum L.p.
(312) 400- Illinois Chicago Wireless American Messaging (am)
(312) 401- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 402- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 403- Illinois La Grange Park Wireless Cellco Partnership DBA Verizon Wireless
(312) 404- Illinois Chicago Wireless T-mobile Usa
(312) 405- Illinois Chicago Wireless Cellco Partnership DBA Verizon Wireless
(312) 406- Illinois Wheeling Wireless New Cingular Wireless PCS
(312) 407- Illinois Chicago Landline Ameritech Illinois
(312) 408- Illinois Chicago Landline Ameritech Illinois
(312) 409- Illinois Chicago Landline Ameritech Illinois
(312) 410- Illinois Chicago Landline Ameritech Illinois