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Area Code 331 Map, Cities and Telecommunication Exchanges

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Area code 331 is located in Illinois. The following table lists the area code exchanges and switches:

331 Area Code Exchanges & Switches:

Prefix Main City Company Zip Code Switch Name Prefix Type Introduced
(331) 200- Chicago T Mobile Usa 60631-3222 CHICAGO PCS 07/12/2011
(331) 200- Chicago Level 3 Communications 60631-3222 CLEC 12/01/2011
(331) 200- Chicago Infotelecom 60631-3222 CLEC 04/27/2012
(331) 201- Cellco Partnership Dba Verizon Wireless WIRELESS 01/06/2012
(331) 201- Cellco Partnership Dba Verizon Wireless WIRELESS 01/09/2012
(331) 201- Cellco Partnership Dba Verizon Wireless WIRELESS 03/30/2012
(331) 201- Cellco Partnership Dba Verizon Wireless WIRELESS 04/23/2012
(331) 201- New Cingular Wireless Pcs WIRELESS 09/26/2012
(331) 201- Cellco Partnership Dba Verizon Wireless WIRELESS 11/29/2012
(331) 202- Arlington Heights Sprint Spectrum 60004-7467 PCS 01/18/2012
(331) 202- Arlington Heights Sprint Spectrum 60004-7467 PCS 01/18/2012
(331) 202- Arlington Heights Sprint Spectrum 60004-7467 PCS 01/18/2012
(331) 202- Arlington Heights Sprint Spectrum 60004-7467 PCS 01/18/2012
(331) 202- Arlington Heights Sprint Spectrum 60004-7467 PCS 01/18/2012
(331) 203- Aurora Sprint Spectrum 60504-7932 PCS 10/12/2011
(331) 203- Aurora Sprint Spectrum 60504-7932 PCS 10/14/2011
(331) 203- Aurora Sprint Spectrum 60504-7932 PCS 10/14/2011
(331) 203- Aurora Sprint Spectrum 60504-7932 PCS 10/14/2011
(331) 203- Aurora Sprint Spectrum 60504-7932 PCS 10/14/2011
(331) 203- Aurora Sprint Spectrum 60504-7932 PCS 10/14/2011
(331) 205- Chicago T Mobile Usa 60631-3222 CHICAGO PCS 10/24/2011
(331) 205- Chicago Sprint Spectrum 60631-3222 PCS 11/03/2011
(331) 205- Chicago Sprint Spectrum 60631-3222 PCS 11/03/2011
(331) 205- Chicago Sprint Spectrum 60631-3222 PCS 11/03/2011
(331) 205- Chicago Bandwidth.Com Clec 60631-3222 CLEC 02/14/2012
(331) 206- Aurora Sprint Spectrum 60504-7932 PCS 10/12/2011
(331) 206- Aurora Sprint Spectrum 60504-7932 PCS 10/14/2011
(331) 206- Aurora Sprint Spectrum 60504-7932 PCS 10/14/2011
(331) 206- Aurora Sprint Spectrum 60504-7932 PCS 10/14/2011
(331) 206- Aurora Sprint Spectrum 60504-7932 PCS 10/14/2011
(331) 206- Aurora Sprint Spectrum 60504-7932 PCS 10/14/2011
(331) 207- Bandwidth.Com Clec CLEC 08/24/2012
(331) 207- Infotelecom CLEC 08/31/2012
(331) 208- Aurora Sprint Spectrum 60504-7932 PCS 11/08/2011
(331) 208- Aurora Sprint Spectrum 60504-7932 PCS 11/09/2011
(331) 208- Aurora Sprint Spectrum 60504-7932 PCS 11/09/2011
(331) 208- Aurora Level 3 Communications 60504-7932 CLEC 12/14/2012
(331) 208- Aurora Xo Illinois 60504-7932 CLEC 11/15/2012
(331) 209- Access One CLEC 03/22/2012
(331) 209- Cbeyond Communications CLEC 11/13/2012
(331) 209- Level 3 Communications CLEC 12/17/2012
(331) 210- Infotelecom CLEC 08/31/2012
(331) 210- Peerless Network Of Illinois CLEC 03/08/2012
(331) 212- Elk Grove Village Mci Worldcom Communications 60007-5216 ELK GROVE CLEC 04/05/2012
(331) 212- Elk Grove Village Cellco Partnership Dba Verizon Wireless 60007-5216 WIRELESS 06/18/2012
(331) 212- Elk Grove Village Mci Worldcom Communications 60007-5216 ELK GROVE CLEC 04/06/2012
(331) 212- Elk Grove Village Comcast Phone Of Illinois, Dba Comco 60007-5216 CLEC 08/17/2012
(331) 212- Elk Grove Village Clear Rate Communications 60007-5216 CLEC 06/04/2012
(331) 213- Hickory Hills Cellco Partnership Dba Verizon Wireless 60457-1075 WIRELESS 09/07/2011
(331) 213- Hickory Hills Bandwidth.Com Clec 60457-1075 CLEC 04/02/2012
(331) 213- Hickory Hills Cellco Partnership Dba Verizon Wireless 60457-1075 WIRELESS 05/02/2012
(331) 213- Hickory Hills Cellco Partnership Dba Verizon Wireless 60457-1075 WIRELESS 05/14/2012
(331) 213- Hickory Hills New Cingular Wireless Pcs 60457-1075 WIRELESS 06/18/2012
(331) 214- Cellco Partnership Dba Verizon Wireless WIRELESS 06/20/2012
(331) 214- Cellco Partnership Dba Verizon Wireless WIRELESS 06/21/2012
(331) 214- Infotelecom CLEC 08/31/2012
(331) 214- Level 3 Communications CLEC 11/30/2012
(331) 215- Hickory Hills Cellco Partnership Dba Verizon Wireless 60457-1075 WIRELESS 10/03/2012
(331) 215- Hickory Hills Cellco Partnership Dba Verizon Wireless 60457-1075 WIRELESS 11/23/2012
(331) 216- New Cingular Wireless Pcs WIRELESS 10/31/2012
(331) 217- UNKNOWN -
(331) 220- Aurora Sprint Spectrum 60504-7932 PCS 07/12/2011
(331) 220- Aurora Sprint Spectrum 60504-7932 PCS 07/12/2011
(331) 220- Aurora Cellco Partnership Dba Verizon Wireless 60504-7932 WIRELESS 09/09/2011
(331) 220- Aurora Sprint Spectrum 60504-7932 PCS 10/10/2011
(331) 220- Aurora Sprint Spectrum 60504-7932 PCS 10/10/2011
(331) 221- ELMHURST Ameritech Illinois 60126 ELMHURST RBOC 01/21/2009
(331) 221- ELMHURST Ameritech Illinois 60126 ELMHURST RBOC 01/22/2009
(331) 221- ELMHURST Ameritech Illinois 60126 ELMHURST RBOC 01/22/2009
(331) 221- ELMHURST Ameritech Illinois 60126 ELMHURST RBOC 01/22/2009
(331) 221- ELMHURST Ameritech Illinois 60126 ELMHURST RBOC 01/22/2009
(331) 221- ELMHURST Ameritech Illinois 60126 ELMHURST RBOC 01/22/2009
(331) 222- Denali Spectrum License PCS 10/31/2008
(331) 222- New Cingular Wireless Pcs WIRELESS 05/06/2010
(331) 222- Peerless Network Of Illinois CLEC 06/22/2010
(331) 222- New Cingular Wireless Pcs WIRELESS 07/29/2010
(331) 222- Cellco Partnership Dba Verizon Wireless WIRELESS 01/14/2011
(331) 223- Denali Spectrum License PCS 10/28/2008
(331) 223- Cellco Partnership Dba Verizon Wireless WIRELESS 08/03/2010
(331) 223- Cellco Partnership Dba Verizon Wireless WIRELESS 08/22/2011
(331) 223- New Cingular Wireless Pcs WIRELESS 06/01/2010
(331) 223- Cellco Partnership Dba Verizon Wireless WIRELESS 05/14/2012
(331) 223- Peerless Network Of Illinois CLEC 10/03/2011
(331) 225- Arlington Heights Sprint Spectrum 60004-7467 PCS 08/22/2011
(331) 225- Arlington Heights Comcast Phone Of Illinois, Dba Comco 60004-7467 CLEC 09/24/2012
(331) 225- Arlington Heights Sprint Spectrum 60004-7467 PCS 08/23/2011
(331) 225- Arlington Heights Sprint Spectrum 60004-7467 PCS 08/23/2011
(331) 225- Arlington Heights Sprint Spectrum 60004-7467 PCS 08/23/2011
(331) 228- Cellco Partnership Dba Verizon Wireless WIRELESS 05/02/2012
(331) 228- Ovation Communications Of Illinois CLEC 04/24/2012
(331) 228- Ovation Communications Of Illinois CLEC 04/24/2012
(331) 228- Ovation Communications Of Illinois CLEC 06/18/2012
(331) 229- Hickory Hills Cellco Partnership Dba Verizon Wireless 60457-1075 WIRELESS 11/30/2012
(331) 248- Comcast Phone Of Illinois, Dba Comco CLEC 07/06/2007
(331) 248- Bandwidth.Com Clec CLEC 07/15/2010
(331) 248- Bandwidth.Com Clec CLEC 06/07/2011
(331) 248- Infotelecom CLEC 09/05/2012
(331) 250- Chicago T Mobile Usa 60631-3222 CHICAGO PCS 08/20/2012
(331) 251- Cellco Partnership Dba Verizon Wireless WIRELESS 12/05/2012
(331) 251- Cellco Partnership Dba Verizon Wireless WIRELESS 12/07/2012
(331) 256- Hickory Hills Cellco Partnership Dba Verizon Wireless 60457-1075 WIRELESS 09/14/2011
(331) 256- Hickory Hills Cellco Partnership Dba Verizon Wireless 60457-1075 WIRELESS 06/01/2012
(331) 256- Hickory Hills Cellco Partnership Dba Verizon Wireless 60457-1075 WIRELESS 06/01/2012
(331) 256- Hickory Hills Cellco Partnership Dba Verizon Wireless 60457-1075 WIRELESS 11/12/2012
(331) 256- Hickory Hills Peerless Network Of Illinois 60457-1075 CLEC 03/01/2012
(331) 262- Aurora Sprint Spectrum 60504-7932 PCS 07/30/2008
(331) 262- Aurora Denali Spectrum License 60504-7932 PCS 05/05/2009
(331) 262- Aurora Denali Spectrum License 60504-7932 PCS 05/05/2009
(331) 262- Aurora Cellco Partnership Dba Verizon Wireless 60504-7932 WIRELESS 06/15/2009
(331) 262- Aurora Cellco Partnership Dba Verizon Wireless 60504-7932 WIRELESS 06/15/2009
(331) 262- Aurora Sprint Spectrum 60504-7932 PCS 07/31/2008
(331) 281- LISLE Ameritech Illinois 60532 NAPERVL BJ BELL LABS RBOC 10/26/2012
(331) 281- LISLE Ameritech Illinois 60532 NAPERVL BJ BELL LABS RBOC 10/26/2012
(331) 281- LISLE Ameritech Illinois 60532 NAPERVL BJ BELL LABS RBOC 10/26/2012
(331) 281- LISLE Ameritech Illinois 60532 NAPERVL BJ BELL LABS RBOC 10/26/2012
(331) 309- UNKNOWN -
(331) 312- UNKNOWN -
(331) 330- Denali Spectrum License PCS 08/22/2008
(331) 330- Level 3 Communications CLEC 10/21/2009
(331) 330- Level 3 Communications CLEC 02/11/2010
(331) 330- New Cingular Wireless Pcs WIRELESS 02/22/2010
(331) 330- Bandwidth.Com Clec CLEC 05/27/2010
(331) 331- UNKNOWN -
(331) 332- Denali Spectrum License PCS 10/10/2011
(331) 332- Ameritech Illinois NAPERVILLE NA RBOC 12/17/2009
(331) 332- Ameritech Illinois NAPERVILLE NA RBOC 12/17/2009
(331) 332- Ameritech Illinois NAPERVILLE NA RBOC 12/17/2009
(331) 332- Ameritech Illinois NAPERVILLE NA RBOC 12/17/2009
(331) 333- Denali Spectrum License PCS 11/03/2008
(331) 333- Peerless Network Of Illinois CLEC 06/22/2010
(331) 333- Peerless Network Of Illinois CLEC 06/22/2010
(331) 333- Ymax Communications Corp CLEC 07/20/2009
(331) 333- Mci Worldcom Communications ELK GROVE CLEC 07/16/2009
(331) 333- Cellco Partnership Dba Verizon Wireless WIRELESS 10/06/2010
(331) 422- Level 3 Communications CLEC 11/13/2008
(331) 422- Global Crossing Local Services CHICAGO CLEC 08/10/2009
(331) 422- Nextel Communications WIRELESS 05/28/2009
(331) 422- New Cingular Wireless Pcs WIRELESS 09/14/2012
(331) 425- Chicago T Mobile Usa 60631-3222 CHICAGO PCS 07/11/2007
(331) 425- Chicago T Mobile Usa 60631-3222 CHICAGO PCS 07/12/2007
(331) 425- Chicago T Mobile Usa 60631-3222 CHICAGO PCS 04/23/2008
(331) 425- Chicago T Mobile Usa 60631-3222 CHICAGO PCS 05/09/2008
(331) 425- Chicago Broadwing Communications 60631-3222 CLEC 04/30/2008
(331) 425- Chicago T Mobile Usa 60631-3222 CHICAGO PCS 07/12/2007
(331) 431- Denali Spectrum License PCS 04/08/2011
(331) 431- Cellco Partnership Dba Verizon Wireless WIRELESS 06/07/2010
(331) 431- Bandwidth.Com Clec CLEC 06/10/2010
(331) 431- Bandwidth.Com Clec CLEC 06/10/2010
(331) 431- Cellco Partnership Dba Verizon Wireless WIRELESS 09/27/2010
(331) 442- Cellco Partnership Dba Verizon Wireless WIRELESS 10/30/2008
(331) 442- New Cingular Wireless Pcs WIRELESS 04/15/2009
(331) 442- Cellco Partnership Dba Verizon Wireless WIRELESS 08/20/2009
(331) 442- New Cingular Wireless Pcs WIRELESS 01/06/2011
(331) 442- Cellco Partnership Dba Verizon Wireless WIRELESS 10/30/2008
(331) 442- Cellco Partnership Dba Verizon Wireless WIRELESS 10/30/2008
(331) 444- NAPERVILLE Bandwidth.Com Clec 60540 CLEC 04/01/2011
(331) 444- NAPERVILLE Bandwidth.Com Clec 60540 CLEC 04/01/2011
(331) 444- NAPERVILLE Cygnus Telecommunications Corporation 60540 NAPERVILLE NA UNKNOWN 08/05/2010
(331) 444- NAPERVILLE Cellco Partnership Dba Verizon Wireless 60540 WIRELESS 10/28/2011
(331) 444- NAPERVILLE Cellco Partnership Dba Verizon Wireless 60540 WIRELESS 09/25/2012
(331) 452- Hickory Hills Cellco Partnership Dba Verizon Wireless 60457-1075 WIRELESS 09/20/2007
(331) 452- Hickory Hills Cellco Partnership Dba Verizon Wireless 60457-1075 WIRELESS 12/07/2007
(331) 452- Hickory Hills Cellco Partnership Dba Verizon Wireless 60457-1075 WIRELESS 11/15/2007
(331) 452- Hickory Hills Cellco Partnership Dba Verizon Wireless 60457-1075 WIRELESS 10/05/2007
(331) 452- Hickory Hills Cellco Partnership Dba Verizon Wireless 60457-1075 WIRELESS 10/05/2007
(331) 452- Hickory Hills Cellco Partnership Dba Verizon Wireless 60457-1075 WIRELESS 09/21/2007
(331) 454- Denali Spectrum License PCS 05/11/2009
(331) 454- Denali Spectrum License PCS 02/23/2010
(331) 454- Sprint Spectrum PCS 04/27/2010
(331) 454- Cellco Partnership Dba Verizon Wireless WIRELESS 10/09/2009
(331) 454- Cellco Partnership Dba Verizon Wireless WIRELESS 11/10/2009
(331) 456- Chicago Globalcom 60607-4568 CLEC 12/05/2007
(331) 456- Chicago Globalcom 60607-4568 CLEC 12/06/2007
(331) 456- Chicago Globalcom 60607-4568 CLEC 12/06/2007
(331) 456- Chicago Globalcom 60607-4568 CLEC 12/06/2007
(331) 456- Chicago Globalcom 60607-4568 CLEC 12/06/2007
(331) 456- Chicago Globalcom 60607-4568 CLEC 12/06/2007
(331) 457- Hickory Hills Cellco Partnership Dba Verizon Wireless 60457-1075 WIRELESS 11/17/2008
(331) 457- Hickory Hills New Cingular Wireless Pcs 60457-1075 WIRELESS 06/10/2010
(331) 457- Hickory Hills Allegiance Telecom 60457-1075 CLEC 02/24/2011
(331) 457- Hickory Hills Cimco Communications 60457-1075 CLEC 03/04/2010
(331) 457- Hickory Hills Us Xchange Of Illinois Dba Choice One Comm 60457-1075 CLEC 10/21/2009
(331) 462- Xo Illinois CLEC 08/23/2008
(331) 462- Xo Illinois CLEC 08/26/2008
(331) 462- Ymax Communications Corp CLEC 01/28/2009
(331) 462- Ymax Communications Corp CLEC 01/28/2009
(331) 462- Ymax Communications Corp CLEC 01/28/2009
(331) 462- Ymax Communications Corp CLEC 01/28/2009
(331) 465- West Chicago Xo Illinois 60185-1797 CHICAGO CLEC 03/12/2009
(331) 465- West Chicago Bandwidth.Com Clec 60185-1797 CHICAGO CLEC 08/12/2010
(331) 465- West Chicago T Mobile Usa 60185-1797 CHICAGO PCS 03/18/2008
(331) 465- West Chicago Us Xchange Of Illinois Dba Choice One Comm 60185-1797 CHICAGO CLEC 10/27/2009
(331) 465- West Chicago Xo Illinois 60185-1797 CLEC 12/02/2008
(331) 472- Chicago T Mobile Usa 60631-3222 CHICAGO PCS 10/22/2008
(331) 472- Chicago Cbeyond Communications 60631-3222 CLEC 11/25/2008
(331) 472- Chicago Level 3 Communications 60631-3222 CLEC 10/27/2010
(331) 472- Chicago Paetec Communications 60631-3222 CLEC 07/14/2009
(331) 472- Chicago Bandwidth.Com Clec 60631-3222 CLEC 01/21/2009
(331) 472- Chicago T Mobile Usa 60631-3222 CHICAGO PCS 10/23/2008
(331) 481- Cellco Partnership Dba Verizon Wireless WIRELESS 10/30/2008
(331) 481- Cellco Partnership Dba Verizon Wireless WIRELESS 08/20/2009
(331) 481- Access One CLEC 01/26/2009
(331) 481- Bandwidth.Com Clec CLEC 09/24/2010
(331) 481- Level 3 Communications CLEC 06/18/2009
(331) 511- UNKNOWN -
(331) 551- Denali Spectrum License PCS 11/07/2008
(331) 551- Denali Spectrum License PCS 11/07/2008
(331) 551- Cimco Communications CLEC 12/30/2009
(331) 551- Peerless Network Of Illinois CLEC 06/22/2010
(331) 551- Bandwidth.Com Clec CLEC 02/17/2011
(331) 575- Aurora Sprint Spectrum 60504-7932 PCS 09/18/2007
(331) 575- Aurora Denali Spectrum License 60504-7932 PCS 10/06/2008
(331) 575- Aurora Denali Spectrum License 60504-7932 PCS 10/06/2008
(331) 575- Aurora Denali Spectrum License 60504-7932 PCS 10/06/2008
(331) 575- Aurora Sprint Spectrum 60504-7932 PCS 04/27/2010
(331) 575- Aurora Sprint Spectrum 60504-7932 PCS 07/01/2008
(331) 588- New Cingular Wireless Pcs WIRELESS 03/18/2011
(331) 588- New Cingular Wireless Pcs WIRELESS 02/16/2010
(331) 588- New Cingular Wireless Pcs WIRELESS 09/21/2011
(331) 588- New Cingular Wireless Pcs WIRELESS 09/14/2012
(331) 588- New Cingular Wireless Pcs WIRELESS 12/07/2011
(331) 591- UNKNOWN -
(331) 618- UNKNOWN -
(331) 625- Cellco Partnership Dba Verizon Wireless WIRELESS 10/20/2009
(331) 625- New Cingular Wireless Pcs WIRELESS 06/21/2010
(331) 625- Cellco Partnership Dba Verizon Wireless WIRELESS 09/16/2010
(331) 625- Peerless Network Of Illinois CLEC 08/10/2010
(331) 625- Peerless Network Of Illinois CLEC 08/10/2010
(331) 630- UNKNOWN -
(331) 642- Bandwidth.Com Clec CLEC 11/13/2008
(331) 642- Sprint Spectrum PCS 07/02/2010
(331) 642- Sprint Spectrum PCS 07/02/2010
(331) 642- Cimco Communications CLEC 03/10/2010
(331) 642- Bandwidth.Com Clec CLEC 11/01/2010
(331) 643- Aurora Sprint Spectrum 60504-7932 PCS 09/18/2007
(331) 643- Aurora Sprint Spectrum 60504-7932 PCS 09/21/2007
(331) 643- Aurora Sprint Spectrum 60504-7932 PCS 09/21/2007
(331) 643- Aurora T Mobile Usa 60504-7932 CHICAGO PCS 02/06/2009
(331) 643- Aurora Sprint Spectrum 60504-7932 PCS 04/27/2010
(331) 643- Aurora Sprint Spectrum 60504-7932 PCS 09/21/2007
(331) 645- Arlington Heights Sprint Spectrum 60004-7467 PCS 06/13/2008
(331) 645- Arlington Heights Sprint Spectrum 60004-7467 PCS 06/13/2008
(331) 645- Arlington Heights Sprint Spectrum 60004-7467 PCS 11/06/2007
(331) 645- Arlington Heights Sprint Spectrum 60004-7467 PCS 11/06/2007
(331) 645- Arlington Heights Sprint Spectrum 60004-7467 PCS 11/06/2007
(331) 684- Sigecom CLEC 07/12/2007
(331) 684- Access One CLEC 08/11/2009
(331) 684- Ymax Communications Corp CLEC 09/30/2008
(331) 684- T Mobile Usa CHICAGO PCS 09/28/2009
(331) 684- Bandwidth.Com Clec CLEC 11/13/2008
(331) 684- Paetec Communications CHICAGO CLEC 08/21/2007
(331) 708- UNKNOWN -
(331) 725- New Cingular Wireless Pcs WIRELESS -
(331) 725- New Cingular Wireless Pcs WIRELESS 09/10/2010
(331) 725- Us Xchange Of Illinois Dba Choice One Comm CLEC 10/29/2009
(331) 725- Ovation Communications Of Illinois CHICAGO CLEC 09/16/2009
(331) 725- Bandwidth.Com Clec CLEC 02/10/2010
(331) 725- New Cingular Wireless Pcs WIRELESS 06/15/2009
(331) 777- Cygnus Telecommunications Corporation UNKNOWN 09/22/2010
(331) 777- Cellco Partnership Dba Verizon Wireless WIRELESS 08/23/2012
(331) 777- Mci Worldcom Communications ELK GROVE CLEC 06/19/2012
(331) 777- Comcast Phone Of Illinois, Dba Comco CLEC 09/28/2012
(331) 777- Cygnus Telecommunications Corporation UNKNOWN 09/28/2010
(331) 811- UNKNOWN -
(331) 825- Digital Network Access Communications UNKNOWN 11/08/2007
(331) 826- Arlington Heights Sprint Spectrum 60004-7467 PCS 11/18/2008
(331) 826- Arlington Heights Us Xchange Of Illinois Dba Choice One Comm 60004-7467 CLEC 10/21/2009
(331) 826- Arlington Heights Peerless Network Of Illinois 60004-7467 CLEC 08/13/2010
(331) 826- Arlington Heights Sprint Spectrum 60004-7467 PCS 08/25/2010
(331) 826- Arlington Heights Sprint Spectrum 60004-7467 PCS 08/25/2010
(331) 826- Arlington Heights Sprint Spectrum 60004-7467 PCS 11/25/2008
(331) 872- UNKNOWN -
(331) 888- Cygnus Telecommunications Corporation UNKNOWN 09/28/2010
(331) 950- UNKNOWN -
(331) 959- Ameritech Illinois RBOC -
(331) 999- Cygnus Telecommunications Corporation UNKNOWN 09/22/2010
(331) 999- Bandwidth.Com Clec CLEC 08/02/2011
(331) 999- Comcast Phone Of Illinois, Dba Comco CLEC 04/05/2012
(331) 999- New Cingular Wireless Pcs WIRELESS 08/15/2012
(331) 999- Bandwidth.Com Clec CLEC 09/13/2012
(331) 999- Cygnus Telecommunications Corporation UNKNOWN 09/28/2010


Cities that Use 331 Area Code

Chicago, Arlington Heights, Aurora, Elk Grove Village, Hickory Hills, Elmhurst, Lisle, Naperville, and West Chicago

331 Area Code External Links