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Area Code Prefixes

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AREA CODE
Prefix # Primary City Phone Provider County Type First Added
(331) 200 Bartlett T-mobile Usa Cell Number July 11th 2011
(331) 201 Downers Grove Cellco Partnership DBA Verizon Wireless Cell Number January 6th 2012
(331) 202 Elmhurst Sprint Spectrum L.p. Cell Number January 17th 2012
(331) 203 Aurora Sprint Spectrum L.p. Cell Number October 12th 2011
(331) 204 Bartlett Broadvox-clec landline and VOIP July 29th 2013
(331) 205 Aurora T-mobile Usa Cell Number October 21st 2011
(331) 206 Aurora Sprint Spectrum L.p. Cell Number October 12th 2011
(331) 207 Yorkville Level 3 Communications Kendall landline and VOIP November 1st 2011
(331) 208 Aurora Sprint Spectrum L.p. Cell Number November 8th 2011
(331) 209 Elmhurst Level 3 Communications Cell Number January 17th 2012
(331) 210 Saint Charles Peerless Network Of Illinois landline and VOIP March 6th 2012
(331) 212 Aurora Mci Worldcom Communications landline and VOIP April 5th 2012
(331) 213 Naperville Cellco Partnership DBA Verizon Wireless Cell Number September 6th 2011
(331) 214 Downers Grove Cellco Partnership DBA Verizon Wireless Cell Number June 20th 2012
(331) 215 Naperville Cellco Partnership DBA Verizon Wireless Cell Number September 28th 2012
(331) 216 Oswego New Cingular Wireless PCS Cell Number October 31st 2012
(331) 218 Wheaton T-mobile Usa Cell Number July 9th 2013
(331) 220 Aurora Sprint Spectrum L.p. Cell Number July 12th 2011
(331) 221 Elmhurst Ameritech Illinois landline and VOIP January 21st 2009
(331) 222 Saint Charles Cricket Communications Cell Number October 28th 2008
(331) 223 Saint Charles Cricket Communications Cell Number October 28th 2008
(331) 225 Elmhurst Sprint Spectrum L.p. Cell Number August 22nd 2011
(331) 228 Saint Charles Ovation Communications Of Illinois Cell Number September 21st 2011
(331) 229 Naperville Cellco Partnership DBA Verizon Wireless Cell Number November 27th 2012
(331) 234 Sugar Grove Cellco Partnership DBA Verizon Wireless Cell Number July 8th 2013
(331) 240 West Chicago Peerless Network Of Illinois landline and VOIP April 10th 2013
(331) 245 Bartlett T-mobile Usa Cell Number April 18th 2013
(331) 248 Geneva Comcast Phone Of Illinois DBA Comco landline and VOIP July 6th 2007
(331) 250 Aurora T-mobile Usa Cell Number April 10th 2012
(331) 251 Downers Grove Cellco Partnership DBA Verizon Wireless Cell Number December 5th 2012
(331) 256 Aurora Cellco Partnership DBA Verizon Wireless Cell Number September 13th 2011
(331) 262 Aurora Sprint Spectrum L.p. Cell Number July 30th 2008
(331) 281 Naperville Ameritech Illinois landline and VOIP October 25th 2012
(331) 301 Aurora Local Access LLC landline and VOIP March 13th 2013
(331) 302 Aurora Cellco Partnership DBA Verizon Wireless Cell Number February 11th 2013
(331) 303 Elburn Cibolo Creek Ventures DBA Routepoint Comm Il landline and VOIP April 22nd 2013
(331) 305 Naperville Cellco Partnership DBA Verizon Wireless Cell Number August 15th 2013
(331) 318 Lemont Local Access LLC landline and VOIP August 1st 2013
(331) 330 Oswego Cricket Communications landline and VOIP August 19th 2008
(331) 332 Naperville Cricket Communications Cell Number November 3rd 2008
(331) 333 Naperville Cricket Communications Cell Number November 3rd 2008
(331) 422 Saint Charles Level 3 Communications landline and VOIP November 13th 2008
(331) 425 Aurora T-mobile Usa Cell Number July 11th 2007
(331) 431 Aurora Bandwidth.com Clec Cell Number May 26th 2010
(331) 442 Saint Charles Cellco Partnership DBA Verizon Wireless Cell Number October 30th 2008
(331) 444 Naperville Cellco Partnership DBA Verizon Wireless landline and VOIP August 4th 2010
(331) 452 Aurora Cellco Partnership DBA Verizon Wireless Cell Number September 20th 2007
(331) 454 Aurora Cricket Communications Cell Number May 7th 2009
(331) 456 Roselle First Communications LLC Dupage landline and VOIP December 5th 2007
(331) 457 Naperville Cellco Partnership DBA Verizon Wireless Cell Number November 14th 2008
(331) 462 Lombard Xo Illinois landline and VOIP August 23rd 2008
(331) 465 West Chicago New Cingular Wireless PCS Cell Number October 17th 2007
(331) 472 Naperville T-mobile Usa Cell Number October 22nd 2008
(331) 481 Downers Grove Cellco Partnership DBA Verizon Wireless Cell Number October 29th 2008
(331) 551 Lombard Cricket Communications Cell Number November 5th 2008
(331) 575 Aurora Sprint Spectrum L.p. Cell Number September 18th 2007
(331) 588 Saint Charles New Cingular Wireless PCS Cell Number February 15th 2010
(331) 625 Downers Grove Cellco Partnership DBA Verizon Wireless Cell Number October 16th 2009
(331) 642 Elmhurst Bandwidth.com Clec Cell Number June 19th 2008
(331) 643 Aurora Sprint Spectrum L.p. Cell Number September 18th 2007
(331) 645 Elmhurst Sprint Spectrum L.p. Cell Number November 5th 2007
(331) 684 Aurora Sigecom landline and VOIP July 12th 2007
(331) 702 Naperville Mci Worldcom Communications landline and VOIP October 23rd 2013
(331) 703 West Chicago T-mobile Usa Cell Number October 24th 2013
(331) 725 Oswego New Cingular Wireless PCS landline and VOIP May 19th 2009
(331) 777 Downers Grove Cellco Partnership DBA Verizon Wireless landline and VOIP September 22nd 2010
(331) 803 Lemont Peerless Network Of Illinois landline and VOIP April 10th 2013
(331) 826 Elmhurst Sprint Spectrum L.p. Cell Number November 18th 2008
(331) 888 Warrenville Peerless Network Of Illinois landline and VOIP September 24th 2010
(331) 999 Oswego Bandwidth.com Clec landline and VOIP September 22nd 2010

Cities With coverage

CITY LIST
Aurora
Bartlett
Downers Grove
Elburn
Elmhurst
Geneva
Lemont
Lombard
Naperville
Oswego
Roselle
Saint Charles
Sugar Grove
Warrenville
West Chicago
Wheaton
Yorkville

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331-200-2164 331-200-0160 331-207-0574 331-207-0574
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