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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) 201- Illinois Chicago Landline Ameritech Illinois
(312) 202- Illinois Chicago Landline Ameritech Illinois
(312) 203- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 204- Illinois Chicago Landline Ameritech Illinois
(312) 205- Illinois Chicago Landline Allegiance Telecom
(312) 206- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 207- Illinois Chicago Landline Ameritech Illinois
(312) 208- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 209- Illinois Northbrook Wireless Cellco Partnership DBA Verizon Wireless
(312) 212- Illinois Chicago Landline Ameritech Illinois
(312) 213- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 214- Illinois Chicago Landline Ameritech Illinois
(312) 215- Illinois Wheeling Wireless New Cingular Wireless PCS
(312) 216- Illinois Chicago Landline First Communications LLC
(312) 217- Illinois Chicago Wireless United States Cellular Corp. - Illinois
(312) 218- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 219- Illinois Chicago Wireless Bandwidth.com Clec
(312) 220- Illinois Chicago Landline Ameritech Illinois
(312) 221- Illinois Chicago Wireless Sprint Spectrum L.p.
(312) 222- Illinois Chicago Landline Ameritech Illinois
(312) 223- Illinois Chicago Landline Ameritech Illinois
(312) 224- Illinois Chicago Landline Broadwing Communications
(312) 225- Illinois Chicago Landline Ameritech Illinois
(312) 226- Illinois Chicago Landline Ameritech Illinois
(312) 227- Illinois Chicago Landline Ameritech Illinois
(312) 228- Illinois Chicago Landline Ameritech Illinois
(312) 229- Illinois Chicago Landline Ameritech Illinois
(312) 230- Illinois Chicago Landline Ameritech Illinois
(312) 231- Illinois Roselle Wireless New Cingular Wireless PCS
(312) 232- Illinois Chicago Wireless American Messaging (am)
(312) 233- Illinois Chicago Landline Ameritech Illinois
(312) 234- Illinois Chicago Landline Ameritech Illinois
(312) 235- Illinois Chicago Landline Ameritech Illinois
(312) 236- Illinois Chicago Landline Ameritech Illinois
(312) 237- Illinois Chicago Wireless Cellco Partnership DBA Verizon Wireless
(312) 238- Illinois Chicago Landline Broadwing Communications
(312) 239- Illinois Chicago Landline AT&T Local
(312) 240- Illinois Chicago Landline Ameritech Illinois
(312) 241- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 242- Illinois Chicago Landline Teleport Communications America
(312) 243- Illinois Chicago Landline Ameritech Illinois
(312) 244- Illinois Chicago Landline Ameritech Illinois
(312) 245- Illinois Chicago Landline Ameritech Illinois
(312) 246- Illinois Wheeling Wireless New Cingular Wireless PCS
(312) 247- Illinois Chicago Landline First Communications LLC
(312) 248- Illinois Unknown Metro PCS
(312) 249- Illinois Chicago Wireless Usa Mobility Wireless
(312) 250- Illinois Chicago Wireless Usa Mobility Wireless
(312) 251- Illinois Chicago Landline Ameritech Illinois
(312) 252- Illinois Chicago Landline Allegiance Telecom
(312) 253- Illinois Chicago Landline Allegiance Telecom
(312) 254- Illinois Chicago Landline Allegiance Telecom
(312) 255- Illinois Chicago Landline Ameritech Illinois
(312) 256- Illinois Chicago Landline Allegiance Telecom
(312) 257- Illinois Chicago Wireless Cellco Partnership DBA Verizon Wireless
(312) 258- Illinois Chicago Landline Ameritech Illinois
(312) 259- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 260- Illinois Chicago Landline Mcimetro Access Transmission Services LLC
(312) 261- Illinois Chicago Landline Broadwing Communications
(312) 262- Illinois Chicago Landline Allegiance Telecom
(312) 263- Illinois Chicago Landline Ameritech Illinois
(312) 264- Illinois Chicago Landline Broadwing Communications
(312) 265- Illinois Chicago Landline Access One
(312) 266- Illinois Chicago Landline Ameritech Illinois
(312) 267- Illinois Chicago Landline Ameritech Illinois
(312) 268- Illinois Chicago Landline Broadwing Communications
(312) 269- Illinois Chicago Landline Ameritech Illinois
(312) 271- Illinois Chicago Wireless Usa Mobility Wireless
(312) 272- Illinois Chicago Wireless Usa Mobility Wireless
(312) 273- Illinois Chicago Wireless Cellco Partnership DBA Verizon Wireless
(312) 274- Illinois Chicago Landline Ameritech Illinois
(312) 275- Illinois Chicago Landline Allegiance Telecom
(312) 276- Illinois Chicago Landline Allegiance Telecom
(312) 277- Illinois Chicago Landline Allegiance Telecom
(312) 278- Illinois Chicago Landline Broadwing Communications
(312) 279- Illinois Chicago Landline Mcimetro Access Transmission Services LLC
(312) 280- Illinois Chicago Landline Ameritech Illinois
(312) 281- Illinois Chicago Landline Global Crossing Local Services-il
(312) 282- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 283- Illinois Chicago Landline Global Crossing Local Services-il
(312) 284- Illinois Chicago Landline Xo Illinois
(312) 285- Illinois Chicago Wireless Sprint Spectrum L.p.
(312) 286- Illinois Chicago Wireless New Cingular Wireless PCS
(312) 287- Illinois Chicago Wireless Sprint Spectrum L.p.
(312) 288- Illinois Chicago Landline Mcimetro Access Transmission Services LLC
(312) 289- Illinois Chicago Wireless Usa Mobility Wireless
(312) 290- Illinois Chicago Wireless Usa Mobility Wireless
(312) 291- Illinois Chicago Landline Ameritech Illinois
(312) 292- Illinois Chicago Wireless Bandwidth.com Clec
(312) 293- Illinois Chicago Landline Ameritech Illinois
(312) 294- Illinois Chicago Landline Ameritech Illinois
(312) 295- Illinois La Grange Park Wireless Usa Mobility Wireless
(312) 296- Illinois Chicago Wireless Sprint Spectrum L.p.
(312) 297- Illinois Chicago Landline Ameritech Illinois
(312) 298- Illinois Chicago Landline Sigecom
(312) 299- Illinois Chicago Wireless Usa Mobility Wireless
(312) 300- Illinois Chicago Landline Net Talk.com
(312) 301- Illinois Hinsdale Wireless New Cingular Wireless PCS
(312) 302- Illinois Chicago Landline Ameritech Illinois
(312) 303- Illinois Wheeling Wireless New Cingular Wireless PCS