Where is area code 312

Area code 312 serves the state of Illinois. This area code was assigned on January 1st, 1947. On January 1st, 1947 it went into service. 312 is a General Purpose Code. 312 service area does overlap with 872 area codes. Dialing pattern for local calls within the same NPA (area code) is 1+10D.

ZIP Codes Served By 312 Area Code

  • 60654
  • 60661
  • 60606
  • 60611
  • 60601
  • 60603
  • 60605
  • 60604
  • 60015
  • 60062
  • 60026
  • 60090
  • 60070
  • 60089
  • 60699
  • 60602
  • 60701
  • 60616
  • 60607
  • 60172
  • 60157
  • 60193
  • 60619
  • 60621
  • 60637
  • 60513
  • 60558
  • 60526
  • 60804
  • 60632
  • 60623
  • 60522
  • 60514
  • 60652
  • 60638
  • 60629
  • 60615
  • 60609
  • 60653
  • 60614
  • 60647
  • 60657
  • 60636
  • 60612
  • 60624

NXX Analysis for 312 Area Code

Active Phone Number Prefixes (NXX) for 312 Area Code

NPA NXX City Usage Company Name NXX Introduced Date
312 201 Landline Ameritech Illinois 11/11/2003
312 201 Landline Ameritech Illinois 11/11/2003
312 201 Landline Ameritech Illinois 11/11/2003
312 202 Landline Ameritech Illinois 04/01/1997
312 202 Landline Ameritech Illinois 04/01/1997
312 202 Landline Ameritech Illinois 04/01/1997
312 203 Wireless New Cingular Wireless Pcs, Llc - Il 11/11/2003
312 203 Wireless New Cingular Wireless Pcs, Llc - Il 11/11/2003
312 203 Wireless New Cingular Wireless Pcs, Llc - Il 11/11/2003
312 204 Landline Ameritech Illinois 10/11/1997
312 204 Landline Ameritech Illinois 10/11/1997
312 204 Landline Ameritech Illinois 10/11/1997
312 205 Landline Allegiance Telecom, Inc. - Il 08/20/2000
312 205 Landline Allegiance Telecom, Inc. - Il 08/20/2000
312 205 Landline Allegiance Telecom, Inc. - Il 08/20/2000
312 206 Wireless New Cingular Wireless Pcs, Llc - Il 11/11/2003
312 206 Wireless New Cingular Wireless Pcs, Llc - Il 11/11/2003
312 206 Wireless New Cingular Wireless Pcs, Llc - Il 11/11/2003
312 207 Landline Ameritech Illinois 10/11/1997
312 207 Landline Ameritech Illinois 10/11/1997
312 207 Landline Ameritech Illinois 10/11/1997
312 208 Wireless New Cingular Wireless Pcs, Llc - Il 11/11/2003
312 208 Wireless New Cingular Wireless Pcs, Llc - Il 11/11/2003
312 208 Wireless New Cingular Wireless Pcs, Llc - Il 11/11/2003
312 209 Wireless Cellco Partnership Dba Verizon Wireless - Il 02/11/1995
312 209 Wireless Cellco Partnership Dba Verizon Wireless - Il 02/11/1995
312 209 Wireless Cellco Partnership Dba Verizon Wireless - Il 02/11/1995
312 212 Landline Ameritech Illinois 10/31/2000
312 212 Landline Ameritech Illinois 10/31/2000
312 212 Landline Ameritech Illinois 10/31/2000
312 213 Wireless New Cingular Wireless Pcs, Llc - Il 11/11/2003
312 213 Wireless New Cingular Wireless Pcs, Llc - Il 11/11/2003
312 213 Wireless New Cingular Wireless Pcs, Llc - Il 11/11/2003
312 214 Landline Ameritech Illinois 11/11/2003
312 214 Landline Ameritech Illinois 11/11/2003
312 214 Landline Ameritech Illinois 11/11/2003
312 215 Wireless New Cingular Wireless Pcs, Llc - Il 02/11/1995
312 215 Wireless New Cingular Wireless Pcs, Llc - Il 02/11/1995
312 215 Wireless New Cingular Wireless Pcs, Llc - Il 02/11/1995
312 216 Landline First Communications Llc - Il 02/13/2012
312 216 Landline First Communications Llc - Il 02/13/2012
312 216 Landline First Communications Llc - Il 02/13/2012
312 217 Wireless Sprint Spectrum L.p. 11/11/2003
312 217 Wireless Sprint Spectrum L.p. 11/11/2003
312 217 Wireless Sprint Spectrum L.p. 11/11/2003
312 218 Wireless New Cingular Wireless Pcs, Llc - Il 11/11/2003
312 218 Wireless New Cingular Wireless Pcs, Llc - Il 11/11/2003
312 218 Wireless New Cingular Wireless Pcs, Llc - Il 11/11/2003
312 219 Wireless Bandwidth.com Clec, Llc - Il 04/10/2012
312 219 Wireless Bandwidth.com Clec, Llc - Il 04/10/2012
312 219 Wireless Bandwidth.com Clec, Llc - Il 04/10/2012
312 220 Landline Ameritech Illinois 02/04/1994
312 220 Landline Ameritech Illinois 02/04/1994
312 220 Landline Ameritech Illinois 02/04/1994
312 221 Wireless Sprint Spectrum L.p. 06/17/2011
312 221 Wireless Sprint Spectrum L.p. 06/17/2011
312 221 Wireless Sprint Spectrum L.p. 06/17/2011
312 222 Landline Ameritech Illinois 02/04/1994
312 222 Landline Ameritech Illinois 02/04/1994
312 222 Landline Ameritech Illinois 02/04/1994
312 223 Landline Ameritech Illinois 10/11/1997
312 223 Landline Ameritech Illinois 10/11/1997
312 223 Landline Ameritech Illinois 10/11/1997
312 224 Landline Broadwing Communications, Llc - Il 10/13/1999
312 224 Landline Broadwing Communications, Llc - Il 10/13/1999
312 224 Landline Broadwing Communications, Llc - Il 10/13/1999
312 225 Landline Ameritech Illinois 10/11/1997
312 225 Landline Ameritech Illinois 10/11/1997
312 225 Landline Ameritech Illinois 10/11/1997
312 226 Landline Ameritech Illinois 10/11/1997
312 226 Landline Ameritech Illinois 10/11/1997
312 226 Landline Ameritech Illinois 10/11/1997
312 227 Landline Ameritech Illinois 09/15/2010
312 227 Landline Ameritech Illinois 09/15/2010
312 227 Landline Ameritech Illinois 09/15/2010
312 228 Landline Ameritech Illinois 10/11/1997
312 228 Landline Ameritech Illinois 10/11/1997
312 228 Landline Ameritech Illinois 10/11/1997
312 229 Landline Ameritech Illinois 06/13/2000
312 229 Landline Ameritech Illinois 06/13/2000
312 229 Landline Ameritech Illinois 06/13/2000
312 230 Landline Ameritech Illinois 10/11/1997
312 230 Landline Ameritech Illinois 10/11/1997
312 230 Landline Ameritech Illinois 10/11/1997
312 231 Wireless New Cingular Wireless Pcs, Llc - Il 01/10/1996
312 231 Wireless New Cingular Wireless Pcs, Llc - Il 01/10/1996
312 231 Wireless New Cingular Wireless Pcs, Llc - Il 01/10/1996
312 232 Wireless American Messaging Services, Llc 04/23/2001
312 232 Wireless American Messaging Services, Llc 04/23/2001
312 232 Wireless American Messaging Services, Llc 04/23/2001
312 233 Landline Ameritech Illinois 10/13/1999
312 233 Landline Ameritech Illinois 10/13/1999
312 233 Landline Ameritech Illinois 10/13/1999
312 234 Landline Ameritech Illinois 01/25/1998
312 234 Landline Ameritech Illinois 01/25/1998
312 234 Landline Ameritech Illinois 01/25/1998
312 235 Landline Ameritech Illinois 01/14/2000
312 235 Landline Ameritech Illinois 01/14/2000
312 235 Landline Ameritech Illinois 01/14/2000
312 236 Landline Ameritech Illinois 11/11/2003
312 236 Landline Ameritech Illinois 11/11/2003
312 236 Landline Ameritech Illinois 11/11/2003
312 237 Wireless Cellco Partnership Dba Verizon Wireless - Il 10/31/2000
312 237 Wireless Cellco Partnership Dba Verizon Wireless - Il 10/31/2000
312 237 Wireless Cellco Partnership Dba Verizon Wireless - Il 10/31/2000
312 238 Landline Broadwing Communications, Llc - Il 10/13/1999
312 238 Landline Broadwing Communications, Llc - Il 10/13/1999
312 238 Landline Broadwing Communications, Llc - Il 10/13/1999
312 239 Landline At&t Local 01/25/1998
312 239 Landline At&t Local 01/25/1998
312 239 Landline At&t Local 01/25/1998
312 240 Landline Ameritech Illinois 10/11/1997
312 240 Landline Ameritech Illinois 10/11/1997
312 240 Landline Ameritech Illinois 10/11/1997
312 241 Wireless New Cingular Wireless Pcs, Llc - Il 08/17/2011
312 241 Wireless New Cingular Wireless Pcs, Llc - Il 08/17/2011
312 241 Wireless New Cingular Wireless Pcs, Llc - Il 08/17/2011
312 242 Landline Teleport Communications America, Llc - Il 08/20/2000
312 242 Landline Teleport Communications America, Llc - Il 08/20/2000
312 242 Landline Teleport Communications America, Llc - Il 08/20/2000
312 243 Landline Ameritech Illinois 10/11/1997
312 243 Landline Ameritech Illinois 10/11/1997
312 243 Landline Ameritech Illinois 10/11/1997
312 244 Landline Ameritech Illinois 10/31/2000
312 244 Landline Ameritech Illinois 10/31/2000
312 244 Landline Ameritech Illinois 10/31/2000
312 245 Landline Ameritech Illinois 10/11/1997
312 245 Landline Ameritech Illinois 10/11/1997
312 245 Landline Ameritech Illinois 10/11/1997
312 246 Wireless New Cingular Wireless Pcs, Llc - Il 02/11/1995
312 246 Wireless New Cingular Wireless Pcs, Llc - Il 02/11/1995
312 246 Wireless New Cingular Wireless Pcs, Llc - Il 02/11/1995
312 247 Landline First Communications Llc - Il 04/06/2004
312 247 Landline First Communications Llc - Il 04/06/2004
312 247 Landline First Communications Llc - Il 04/06/2004
312 248 Wireless Metro Pcs, Inc. 07/01/2014
312 248 Wireless Metro Pcs, Inc. 07/01/2014
312 248 Wireless Metro Pcs, Inc. 07/01/2014
312 249 Wireless Usa Mobility Wireless, Inc. 02/04/1994
312 249 Wireless Usa Mobility Wireless, Inc. 02/04/1994
312 249 Wireless Usa Mobility Wireless, Inc. 02/04/1994
312 250 Wireless Usa Mobility Wireless, Inc. 02/04/1994
312 250 Wireless Usa Mobility Wireless, Inc. 02/04/1994
312 250 Wireless Usa Mobility Wireless, Inc. 02/04/1994
312 251 Landline Ameritech Illinois 10/11/1997
312 251 Landline Ameritech Illinois 10/11/1997
312 251 Landline Ameritech Illinois 10/11/1997
312 252 Landline Allegiance Telecom, Inc. - Il 01/25/1998
312 252 Landline Allegiance Telecom, Inc. - Il 01/25/1998
312 252 Landline Allegiance Telecom, Inc. - Il 01/25/1998
312 253 Landline Allegiance Telecom, Inc. - Il 01/25/1998
312 253 Landline Allegiance Telecom, Inc. - Il 01/25/1998
312 253 Landline Allegiance Telecom, Inc. - Il 01/25/1998
312 254 Landline Allegiance Telecom, Inc. - Il 01/25/1998
312 254 Landline Allegiance Telecom, Inc. - Il 01/25/1998
312 254 Landline Allegiance Telecom, Inc. - Il 01/25/1998
312 255 Landline Ameritech Illinois 10/11/1997
312 255 Landline Ameritech Illinois 10/11/1997
312 255 Landline Ameritech Illinois 10/11/1997
312 256 Landline Allegiance Telecom, Inc. - Il 01/25/1998
312 256 Landline Allegiance Telecom, Inc. - Il 01/25/1998
312 256 Landline Allegiance Telecom, Inc. - Il 01/25/1998
312 257 Wireless Cellco Partnership Dba Verizon Wireless - Il 08/18/2011
312 257 Wireless Cellco Partnership Dba Verizon Wireless - Il 08/18/2011
312 257 Wireless Cellco Partnership Dba Verizon Wireless - Il 08/18/2011
312 258 Landline Ameritech Illinois 10/11/1997
312 258 Landline Ameritech Illinois 10/11/1997
312 258 Landline Ameritech Illinois 10/11/1997
312 259 Wireless New Cingular Wireless Pcs, Llc - Il 11/11/2003
312 259 Wireless New Cingular Wireless Pcs, Llc - Il 11/11/2003
312 259 Wireless New Cingular Wireless Pcs, Llc - Il 11/11/2003
312 260 Landline Mcimetro Access Transmission Services Llc 04/01/1997
312 260 Landline Mcimetro Access Transmission Services Llc 04/01/1997
312 260 Landline Mcimetro Access Transmission Services Llc 04/01/1997
312 261 Landline Broadwing Communications, Llc - Il 05/10/1999
312 261 Landline Broadwing Communications, Llc - Il 05/10/1999
312 261 Landline Broadwing Communications, Llc - Il 05/10/1999
312 262 Landline Allegiance Telecom, Inc. - Il 01/25/1998
312 262 Landline Allegiance Telecom, Inc. - Il 01/25/1998
312 262 Landline Allegiance Telecom, Inc. - Il 01/25/1998
312 263 Landline Ameritech Illinois 02/04/1994
312 263 Landline Ameritech Illinois 02/04/1994
312 263 Landline Ameritech Illinois 02/04/1994
312 264 Landline Broadwing Communications, Llc - Il 07/22/1999
312 264 Landline Broadwing Communications, Llc - Il 07/22/1999
312 264 Landline Broadwing Communications, Llc - Il 07/22/1999
312 265 Landline Access One, Inc. - Il 11/29/2005
312 265 Landline Access One, Inc. - Il 11/29/2005
312 265 Landline Access One, Inc. - Il 11/29/2005
312 266 Landline Ameritech Illinois 02/04/1994
312 266 Landline Ameritech Illinois 02/04/1994