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| State: | Illinois |
| Time Zone: | Central (GMT -06:00) |
| Cities Serving: | Hanover Park Bartlett Downers Grove Woodridge Elmhurst Aurora Montgomery Naperville Yorkville Saint Charles Geneva Oswego Wheaton Sugar Grove Dupage West Chicago Warrenville Bolingbrook Lemont Homer Glen Bensenville Elburn Lombard Big Rock Bristol Roselle Maple Park Plano Kane |
Area code 331 serves the state of Illinois. This area code was assigned on July 23rd, 1999. On October 7th, 2007 it went into service. 331 is a General Purpose Code. 331 service area does overlap with 630 area codes. Dialing pattern for local calls within the same NPA (area code) is 1+10D.
| NPA | NXX | City | Usage | Company Name | NXX Introduced Date |
|---|---|---|---|---|---|
| 331 | 200 | Hanover Park | Wireless | T-mobile Usa, Inc. | 07/11/2011 |
| 331 | 200 | Bartlett | Wireless | T-mobile Usa, Inc. | 07/11/2011 |
| 331 | 201 | Downers Grove | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 01/06/2012 |
| 331 | 201 | Downers Grove | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 01/06/2012 |
| 331 | 201 | Woodridge | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 01/06/2012 |
| 331 | 202 | Elmhurst | Wireless | Sprint Spectrum L.p. | 01/17/2012 |
| 331 | 203 | Aurora | Wireless | Sprint Spectrum L.p. | 10/12/2011 |
| 331 | 203 | Aurora | Wireless | Sprint Spectrum L.p. | 10/12/2011 |
| 331 | 203 | Montgomery | Wireless | Sprint Spectrum L.p. | 10/12/2011 |
| 331 | 204 | Naperville | Landline | Neutral Tandem-illinois, Llc - Il | 12/10/2015 |
| 331 | 204 | Naperville | Landline | Neutral Tandem-illinois, Llc - Il | 12/10/2015 |
| 331 | 204 | Naperville | Landline | Neutral Tandem-illinois, Llc - Il | 12/10/2015 |
| 331 | 205 | Aurora | Wireless | T-mobile Usa, Inc. | 10/21/2011 |
| 331 | 205 | Aurora | Wireless | T-mobile Usa, Inc. | 10/21/2011 |
| 331 | 205 | Montgomery | Wireless | T-mobile Usa, Inc. | 10/21/2011 |
| 331 | 206 | Aurora | Wireless | Sprint Spectrum L.p. | 10/12/2011 |
| 331 | 206 | Aurora | Wireless | Sprint Spectrum L.p. | 10/12/2011 |
| 331 | 206 | Montgomery | Wireless | Sprint Spectrum L.p. | 10/12/2011 |
| 331 | 207 | Yorkville | Landline | Level 3 Communications, Llc - Il | 11/01/2011 |
| 331 | 208 | Aurora | Wireless | Sprint Spectrum L.p. | 11/08/2011 |
| 331 | 208 | Aurora | Wireless | Sprint Spectrum L.p. | 11/08/2011 |
| 331 | 208 | Montgomery | Wireless | Sprint Spectrum L.p. | 11/08/2011 |
| 331 | 209 | Elmhurst | Wireless | Level 3 Communications, Llc - Il | 01/17/2012 |
| 331 | 210 | Saint Charles | Landline | Peerless Network Of Illinois, Llc - Il | 03/06/2012 |
| 331 | 210 | Saint Charles | Landline | Peerless Network Of Illinois, Llc - Il | 03/06/2012 |
| 331 | 210 | Geneva | Landline | Peerless Network Of Illinois, Llc - Il | 03/06/2012 |
| 331 | 212 | Aurora | Landline | Mci Worldcom Communications, Inc. - Il | 04/05/2012 |
| 331 | 212 | Aurora | Landline | Mci Worldcom Communications, Inc. - Il | 04/05/2012 |
| 331 | 212 | Montgomery | Landline | Mci Worldcom Communications, Inc. - Il | 04/05/2012 |
| 331 | 213 | Naperville | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 09/06/2011 |
| 331 | 213 | Naperville | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 09/06/2011 |
| 331 | 213 | Naperville | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 09/06/2011 |
| 331 | 214 | Downers Grove | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 06/20/2012 |
| 331 | 214 | Downers Grove | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 06/20/2012 |
| 331 | 214 | Woodridge | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 06/20/2012 |
| 331 | 215 | Naperville | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 09/28/2012 |
| 331 | 215 | Naperville | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 09/28/2012 |
| 331 | 215 | Naperville | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 09/28/2012 |
| 331 | 216 | Oswego | Wireless | New Cingular Wireless Pcs, Llc - Il | 10/31/2012 |
| 331 | 218 | Wheaton | Wireless | T-mobile Usa, Inc. | 07/09/2013 |
| 331 | 218 | Wheaton | Wireless | T-mobile Usa, Inc. | 07/09/2013 |
| 331 | 219 | Aurora | Landline | Telnyx Llc | 03/16/2017 |
| 331 | 219 | Aurora | Landline | Telnyx Llc | 03/16/2017 |
| 331 | 219 | Montgomery | Landline | Telnyx Llc | 03/16/2017 |
| 331 | 220 | Aurora | Wireless | Sprint Spectrum L.p. | 07/12/2011 |
| 331 | 220 | Aurora | Wireless | Sprint Spectrum L.p. | 07/12/2011 |
| 331 | 220 | Montgomery | Wireless | Sprint Spectrum L.p. | 07/12/2011 |
| 331 | 221 | Elmhurst | Landline | Ameritech Illinois | 01/21/2009 |
| 331 | 222 | Saint Charles | Wireless | New Cingular Wireless Pcs, Llc - Il | 10/28/2008 |
| 331 | 222 | Saint Charles | Wireless | New Cingular Wireless Pcs, Llc - Il | 10/28/2008 |
| 331 | 222 | Geneva | Wireless | New Cingular Wireless Pcs, Llc - Il | 10/28/2008 |
| 331 | 223 | Saint Charles | Wireless | New Cingular Wireless Pcs, Llc - Il | 10/28/2008 |
| 331 | 223 | Saint Charles | Wireless | New Cingular Wireless Pcs, Llc - Il | 10/28/2008 |
| 331 | 223 | Geneva | Wireless | New Cingular Wireless Pcs, Llc - Il | 10/28/2008 |
| 331 | 225 | Elmhurst | Wireless | Sprint Spectrum L.p. | 08/22/2011 |
| 331 | 226 | Naperville | Wireless | T-mobile Usa, Inc. | 03/20/2017 |
| 331 | 226 | Naperville | Wireless | T-mobile Usa, Inc. | 03/20/2017 |
| 331 | 226 | Naperville | Wireless | T-mobile Usa, Inc. | 03/20/2017 |
| 331 | 227 | Sugar Grove | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 05/17/2016 |
| 331 | 228 | Saint Charles | Wireless | Ovation Communications Of Illinois, Inc. | 09/21/2011 |
| 331 | 228 | Saint Charles | Wireless | Ovation Communications Of Illinois, Inc. | 09/21/2011 |
| 331 | 228 | Geneva | Wireless | Ovation Communications Of Illinois, Inc. | 09/21/2011 |
| 331 | 229 | Naperville | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 11/27/2012 |
| 331 | 229 | Naperville | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 11/27/2012 |
| 331 | 229 | Naperville | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 11/27/2012 |
| 331 | 230 | Aurora | Wireless | T-mobile Usa, Inc. | 04/05/2017 |
| 331 | 230 | Aurora | Wireless | T-mobile Usa, Inc. | 04/05/2017 |
| 331 | 230 | Montgomery | Wireless | T-mobile Usa, Inc. | 04/05/2017 |
| 331 | 231 | Dupage | Unknown | New Cingular Wireless Pcs, Llc - Il | 08/07/2017 |
| 331 | 232 | Unknown | New Cingular Wireless Pcs, Llc - Il | 08/08/2017 | |
| 331 | 233 | Downers Grove | Landline | Telnyx Llc | 03/13/2017 |
| 331 | 233 | Downers Grove | Landline | Telnyx Llc | 03/13/2017 |
| 331 | 233 | Woodridge | Landline | Telnyx Llc | 03/13/2017 |
| 331 | 234 | Sugar Grove | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 07/08/2013 |
| 331 | 236 | Wheaton | Wireless | T-mobile Usa, Inc. | 04/05/2017 |
| 331 | 236 | Wheaton | Wireless | T-mobile Usa, Inc. | 04/05/2017 |
| 331 | 240 | West Chicago | Landline | Peerless Network Of Illinois, Llc - Il | 04/10/2013 |
| 331 | 244 | Dupage | Unknown | Neutral Tandem-illinois, Llc | 09/21/2017 |
| 331 | 245 | Hanover Park | Wireless | T-mobile Usa, Inc. | 04/18/2013 |
| 331 | 245 | Bartlett | Wireless | T-mobile Usa, Inc. | 04/18/2013 |
| 331 | 248 | Geneva | Landline | Comcast Phone Of Illinois, Llc Dba Comco - Il | 07/06/2007 |
| 331 | 250 | Aurora | Wireless | T-mobile Usa, Inc. | 04/10/2012 |
| 331 | 250 | Aurora | Wireless | T-mobile Usa, Inc. | 04/10/2012 |
| 331 | 250 | Montgomery | Wireless | T-mobile Usa, Inc. | 04/10/2012 |
| 331 | 251 | Downers Grove | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 12/05/2012 |
| 331 | 251 | Downers Grove | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 12/05/2012 |
| 331 | 251 | Woodridge | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 12/05/2012 |
| 331 | 252 | Warrenville | Landline | Teleport Communications America, Llc - Il | 06/02/2016 |
| 331 | 253 | Lemont | Wireless | T-mobile Usa, Inc. | 10/27/2014 |
| 331 | 253 | Bolingbrook | Wireless | T-mobile Usa, Inc. | 10/27/2014 |
| 331 | 253 | Homer Glen | Wireless | T-mobile Usa, Inc. | 10/27/2014 |
| 331 | 254 | Sugar Grove | Wireless | T-mobile Usa, Inc. | 07/16/2014 |
| 331 | 255 | Dupage | Unknown | Neutral Tandem-illinois, Llc | 08/22/2017 |
| 331 | 256 | Aurora | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 09/13/2011 |
| 331 | 256 | Aurora | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 09/13/2011 |
| 331 | 256 | Montgomery | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 09/13/2011 |
| 331 | 262 | Aurora | Wireless | Sprint Spectrum L.p. | 07/30/2008 |
| 331 | 262 | Aurora | Wireless | Sprint Spectrum L.p. | 07/30/2008 |
| 331 | 262 | Montgomery | Wireless | Sprint Spectrum L.p. | 07/30/2008 |
| 331 | 263 | Bensenville | Landline | Neutral Tandem-illinois, Llc - Il | 03/11/2016 |
| 331 | 276 | Saint Charles | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 11/10/2014 |
| 331 | 276 | Saint Charles | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 11/10/2014 |
| 331 | 276 | Geneva | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 11/10/2014 |
| 331 | 281 | Naperville | Landline | Ameritech Illinois | 10/25/2012 |
| 331 | 281 | Naperville | Landline | Ameritech Illinois | 10/25/2012 |
| 331 | 281 | Naperville | Landline | Ameritech Illinois | 10/25/2012 |
| 331 | 300 | Aurora | Wireless | T-mobile Usa, Inc. | 03/17/2016 |
| 331 | 300 | Aurora | Wireless | T-mobile Usa, Inc. | 03/17/2016 |
| 331 | 300 | Montgomery | Wireless | T-mobile Usa, Inc. | 03/17/2016 |
| 331 | 301 | Aurora | Landline | Local Access Llc - Il | 03/13/2013 |
| 331 | 301 | Aurora | Landline | Local Access Llc - Il | 03/13/2013 |
| 331 | 301 | Montgomery | Landline | Local Access Llc - Il | 03/13/2013 |
| 331 | 302 | Aurora | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 02/11/2013 |
| 331 | 302 | Aurora | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 02/11/2013 |
| 331 | 302 | Montgomery | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 02/11/2013 |
| 331 | 303 | Elburn | Landline | Cibolo Creek Ventures, Llc Dba Routepoint Comm Il | 04/22/2013 |
| 331 | 304 | Hanover Park | Wireless | T-mobile Usa, Inc. | 02/20/2015 |
| 331 | 304 | Bartlett | Wireless | T-mobile Usa, Inc. | 02/20/2015 |
| 331 | 305 | Naperville | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 08/15/2013 |
| 331 | 305 | Naperville | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 08/15/2013 |
| 331 | 305 | Naperville | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 08/15/2013 |
| 331 | 307 | Lombard | Wireless | T-mobile Usa, Inc. | 10/13/2014 |
| 331 | 308 | Hanover Park | Landline | Bandwidth.com Clec, Llc - Il | 12/23/2014 |
| 331 | 308 | Bartlett | Landline | Bandwidth.com Clec, Llc - Il | 12/23/2014 |
| 331 | 310 | Big Rock | Landline | Bandwidth.com Clec, Llc - Il | 12/29/2014 |
| 331 | 315 | Lombard | Wireless | New Cingular Wireless Pcs, Llc - Il | 08/08/2016 |
| 331 | 318 | Lemont | Landline | Local Access Llc - Il | 08/01/2013 |
| 331 | 318 | Bolingbrook | Landline | Local Access Llc - Il | 08/01/2013 |
| 331 | 318 | Homer Glen | Landline | Local Access Llc - Il | 08/01/2013 |
| 331 | 321 | Aurora | Wireless | T-mobile Usa, Inc. | 07/20/2015 |
| 331 | 321 | Aurora | Wireless | T-mobile Usa, Inc. | 07/20/2015 |
| 331 | 321 | Montgomery | Wireless | T-mobile Usa, Inc. | 07/20/2015 |
| 331 | 330 | Montgomery | Landline | New Cingular Wireless Pcs, Llc - Il | 08/19/2008 |
| 331 | 330 | Bristol | Landline | New Cingular Wireless Pcs, Llc - Il | 08/19/2008 |
| 331 | 330 | Oswego | Landline | New Cingular Wireless Pcs, Llc - Il | 08/19/2008 |
| 331 | 332 | Naperville | Wireless | New Cingular Wireless Pcs, Llc - Il | 11/03/2008 |
| 331 | 332 | Naperville | Wireless | New Cingular Wireless Pcs, Llc - Il | 11/03/2008 |
| 331 | 332 | Naperville | Wireless | New Cingular Wireless Pcs, Llc - Il | 11/03/2008 |
| 331 | 333 | Naperville | Wireless | New Cingular Wireless Pcs, Llc - Il | 11/03/2008 |
| 331 | 333 | Naperville | Wireless | New Cingular Wireless Pcs, Llc - Il | 11/03/2008 |
| 331 | 333 | Naperville | Wireless | New Cingular Wireless Pcs, Llc - Il | 11/03/2008 |
| 331 | 385 | Aurora | Wireless | New Cingular Wireless Pcs, Llc - Il | 09/28/2016 |
| 331 | 385 | Aurora | Wireless | New Cingular Wireless Pcs, Llc - Il | 09/28/2016 |
| 331 | 385 | Montgomery | Wireless | New Cingular Wireless Pcs, Llc - Il | 09/28/2016 |
| 331 | 401 | Naperville | Landline | Level 3 Communications, Llc - Il | 12/14/2015 |
| 331 | 401 | Naperville | Landline | Level 3 Communications, Llc - Il | 12/14/2015 |
| 331 | 401 | Naperville | Landline | Level 3 Communications, Llc - Il | 12/14/2015 |
| 331 | 422 | Saint Charles | Landline | Level 3 Communications, Llc - Il | 11/13/2008 |
| 331 | 422 | Saint Charles | Landline | Level 3 Communications, Llc - Il | 11/13/2008 |
| 331 | 422 | Geneva | Landline | Level 3 Communications, Llc - Il | 11/13/2008 |
| 331 | 425 | Aurora | Wireless | T-mobile Usa, Inc. | 07/11/2007 |
| 331 | 425 | Aurora | Wireless | T-mobile Usa, Inc. | 07/11/2007 |
| 331 | 425 | Montgomery | Wireless | T-mobile Usa, Inc. | 07/11/2007 |
| 331 | 431 | Aurora | Wireless | Bandwidth.com Clec, Llc - Il | 05/26/2010 |
| 331 | 431 | Aurora | Wireless | Bandwidth.com Clec, Llc - Il | 05/26/2010 |
| 331 | 431 | Montgomery | Wireless | Bandwidth.com Clec, Llc - Il | 05/26/2010 |
| 331 | 442 | Saint Charles | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 10/30/2008 |
| 331 | 442 | Saint Charles | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 10/30/2008 |
| 331 | 442 | Geneva | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 10/30/2008 |
| 331 | 444 | Naperville | Landline | Cellco Partnership Dba Verizon Wireless - Il | 08/04/2010 |
| 331 | 444 | Naperville | Landline | Cellco Partnership Dba Verizon Wireless - Il | 08/04/2010 |
| 331 | 444 | Naperville | Landline | Cellco Partnership Dba Verizon Wireless - Il | 08/04/2010 |
| 331 | 452 | Aurora | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 09/20/2007 |
| 331 | 452 | Aurora | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 09/20/2007 |
| 331 | 452 | Montgomery | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 09/20/2007 |
| 331 | 454 | Aurora | Wireless | New Cingular Wireless Pcs, Llc - Il | 05/07/2009 |
| 331 | 454 | Aurora | Wireless | New Cingular Wireless Pcs, Llc - Il | 05/07/2009 |
| 331 | 454 | Montgomery | Wireless | New Cingular Wireless Pcs, Llc - Il | 05/07/2009 |
| 331 | 456 | Roselle | Landline | First Communications Llc - Il | 12/05/2007 |
| 331 | 457 | Naperville | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 11/14/2008 |
| 331 | 457 | Naperville | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 11/14/2008 |
| 331 | 457 | Naperville | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 11/14/2008 |
| 331 | 462 | Lombard | Landline | Xo Illinois, Inc. | 08/23/2008 |
| 331 | 465 | West Chicago | Wireless | New Cingular Wireless Pcs, Llc - Il | 10/17/2007 |
| 331 | 472 | Naperville | Wireless | T-mobile Usa, Inc. | 10/22/2008 |
| 331 | 472 | Naperville | Wireless | T-mobile Usa, Inc. | 10/22/2008 |
| 331 | 472 | Naperville | Wireless | T-mobile Usa, Inc. | 10/22/2008 |
| 331 | 481 | Downers Grove | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 10/29/2008 |
| 331 | 481 | Downers Grove | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 10/29/2008 |
| 331 | 481 | Woodridge | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 10/29/2008 |
| 331 | 551 | Lombard | Wireless | New Cingular Wireless Pcs, Llc - Il | 11/05/2008 |
| 331 | 575 | Aurora | Wireless | Sprint Spectrum L.p. | 09/18/2007 |
| 331 | 575 | Aurora | Wireless | Sprint Spectrum L.p. | 09/18/2007 |
| 331 | 575 | Montgomery | Wireless | Sprint Spectrum L.p. | 09/18/2007 |
| 331 | 588 | Saint Charles | Wireless | New Cingular Wireless Pcs, Llc - Il | 02/15/2010 |
| 331 | 588 | Saint Charles | Wireless | New Cingular Wireless Pcs, Llc - Il | 02/15/2010 |
| 331 | 588 | Geneva | Wireless | New Cingular Wireless Pcs, Llc - Il | 02/15/2010 |
| 331 | 625 | Downers Grove | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 10/16/2009 |
| 331 | 625 | Downers Grove | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 10/16/2009 |
| 331 | 625 | Woodridge | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 10/16/2009 |
| 331 | 642 | Elmhurst | Wireless | Bandwidth.com Clec, Llc - Il | 06/19/2008 |
| 331 | 643 | Aurora | Wireless | Sprint Spectrum L.p. | 09/18/2007 |
| 331 | 643 | Aurora | Wireless | Sprint Spectrum L.p. | 09/18/2007 |
| 331 | 643 | Montgomery | Wireless | Sprint Spectrum L.p. | 09/18/2007 |
| 331 | 645 | Elmhurst | Wireless | Sprint Spectrum L.p. | 11/05/2007 |
| 331 | 684 | Aurora | Landline | Sigecom, Llc Dba Wow Internet Cable And Phone | 07/12/2007 |
| 331 | 684 | Aurora | Landline | Sigecom, Llc Dba Wow Internet Cable And Phone | 07/12/2007 |
| 331 | 684 | Montgomery | Landline | Sigecom, Llc Dba Wow Internet Cable And Phone | 07/12/2007 |
| 331 | 701 | Naperville | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 12/11/2014 |
| 331 | 701 | Naperville | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 12/11/2014 |
| 331 | 701 | Naperville | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 12/11/2014 |
| 331 | 702 | Naperville | Landline | Mci Worldcom Communications, Inc. - Il | 10/23/2013 |
| 331 | 702 | Naperville | Landline | Mci Worldcom Communications, Inc. - Il | 10/23/2013 |
| 331 | 702 | Naperville | Landline | Mci Worldcom Communications, Inc. - Il | 10/23/2013 |
| 331 | 703 | West Chicago | Wireless | T-mobile Usa, Inc. | 10/24/2013 |
| 331 | 704 | Sugar Grove | Landline | Bandwidth.com Clec, Llc - Il | 04/21/2015 |
| 331 | 704 | Elburn | Landline | Bandwidth.com Clec, Llc - Il | 04/21/2015 |
| 331 | 704 | Maple Park | Landline | Bandwidth.com Clec, Llc - Il | 04/21/2015 |
| 331 | 707 | Aurora | Wireless | T-mobile Usa, Inc. | 08/23/2016 |
| 331 | 707 | Aurora | Wireless | T-mobile Usa, Inc. | 08/23/2016 |
| 331 | 707 | Montgomery | Wireless | T-mobile Usa, Inc. | 08/23/2016 |
| 331 | 716 | Wheaton | Landline | Broadvox-clec, Llc - Il | 01/18/2016 |
| 331 | 716 | Wheaton | Landline | Broadvox-clec, Llc - Il | 01/18/2016 |
| 331 | 717 | Oswego | Wireless | New Cingular Wireless Pcs, Llc - Il | 01/18/2016 |
| 331 | 725 | Oswego | Landline | New Cingular Wireless Pcs, Llc - Il | 05/19/2009 |
| 331 | 757 | Lemont | Wireless | T-mobile Usa, Inc. | 07/13/2016 |
| 331 | 757 | Bolingbrook | Wireless | T-mobile Usa, Inc. | 07/13/2016 |
| 331 | 757 | Homer Glen | Wireless | T-mobile Usa, Inc. | 07/13/2016 |
| 331 | 771 | Saint Charles | Landline | Neutral Tandem-illinois, Llc - Il | 02/10/2016 |
| 331 | 771 | Saint Charles | Landline | Neutral Tandem-illinois, Llc - Il | 02/10/2016 |
| 331 | 771 | Geneva | Landline | Neutral Tandem-illinois, Llc - Il | 02/10/2016 |
| 331 | 775 | Downers Grove | Landline | Comcast Phone Of Illinois, Llc Dba Comco - Il | 01/04/2016 |
| 331 | 775 | Downers Grove | Landline | Comcast Phone Of Illinois, Llc Dba Comco - Il | 01/04/2016 |
| 331 | 775 | Woodridge | Landline | Comcast Phone Of Illinois, Llc Dba Comco - Il | 01/04/2016 |
| 331 | 777 | Downers Grove | Landline | Cellco Partnership Dba Verizon Wireless - Il | 09/22/2010 |
| 331 | 777 | Downers Grove | Landline | Cellco Partnership Dba Verizon Wireless - Il | 09/22/2010 |
| 331 | 777 | Woodridge | Landline | Cellco Partnership Dba Verizon Wireless - Il | 09/22/2010 |
| 331 | 801 | Downers Grove | Landline | Teleport Communications America, Llc - Il | 05/15/2014 |
| 331 | 801 | Downers Grove | Landline | Teleport Communications America, Llc - Il | 05/15/2014 |
| 331 | 801 | Woodridge | Landline | Teleport Communications America, Llc - Il | 05/15/2014 |
| 331 | 803 | Lemont | Landline | Peerless Network Of Illinois, Llc - Il | 04/10/2013 |
| 331 | 803 | Bolingbrook | Landline | Peerless Network Of Illinois, Llc - Il | 04/10/2013 |
| 331 | 803 | Homer Glen | Landline | Peerless Network Of Illinois, Llc - Il | 04/10/2013 |
| 331 | 806 | Wheaton | Landline | Comcast Phone Of Illinois, Llc Dba Comco - Il | 06/11/2015 |
| 331 | 806 | Wheaton | Landline | Comcast Phone Of Illinois, Llc Dba Comco - Il | 06/11/2015 |
| 331 | 808 | Plano | Landline | Bandwidth.com Clec, Llc - Il | 06/05/2015 |
| 331 | 814 | Naperville | Wireless | T-mobile Usa, Inc. | 06/25/2015 |
| 331 | 814 | Naperville | Wireless | T-mobile Usa, Inc. | 06/25/2015 |
| 331 | 814 | Naperville | Wireless | T-mobile Usa, Inc. | 06/25/2015 |
| 331 | 825 | Kane | Unknown | Digital Network Access Communications, Inc. - Il | 11/08/2007 |
| 331 | 826 | Elmhurst | Wireless | Sprint Spectrum L.p. | 11/18/2008 |
| 331 | 871 | West Chicago | Landline | Neutral Tandem-illinois, Llc - Il | 02/17/2016 |
| 331 | 888 | Warrenville | Landline | Peerless Network Of Illinois, Llc - Il | 09/24/2010 |
| 331 | 901 | Saint Charles | Landline | Bandwidth.com Clec, Llc - Il | 04/23/2015 |
| 331 | 901 | Saint Charles | Landline | Bandwidth.com Clec, Llc - Il | 04/23/2015 |
| 331 | 901 | Geneva | Landline | Bandwidth.com Clec, Llc - Il | 04/23/2015 |
| 331 | 903 | Downers Grove | Landline | At&t Corp. | 05/15/2014 |
| 331 | 903 | Downers Grove | Landline | At&t Corp. | 05/15/2014 |
| 331 | 903 | Woodridge | Landline | At&t Corp. | 05/15/2014 |
| 331 | 979 | Elmhurst | Landline | Comcast Phone Of Illinois, Llc Dba Comco - Il | 03/03/2015 |
| 331 | 980 | Aurora | Wireless | T-mobile Usa, Inc. | 10/13/2014 |
| 331 | 980 | Aurora | Wireless | T-mobile Usa, Inc. | 10/13/2014 |
| 331 | 980 | Montgomery | Wireless | T-mobile Usa, Inc. | 10/13/2014 |
| 331 | 998 | Downers Grove | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 09/16/2015 |
| 331 | 998 | Downers Grove | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 09/16/2015 |
| 331 | 998 | Woodridge | Wireless | Cellco Partnership Dba Verizon Wireless - Il | 09/16/2015 |
| 331 | 999 | Oswego | Landline | Bandwidth.com Clec, Llc - Il | 09/22/2010 |
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