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331 Area Code

State:Illinois
Major City:Aurora
Timezone:Central
Current Time:

History of area code 331

331 was first put in service October 7, 2007. It was created from area code 630.

Where is area code 331

Area code 331 is located in Illinois and covers Aurora, Naperville, Bolingbrook, and Wheaton. It is an overlay for area code 630 and serves the same area.

What time zone is area code 331?

The 331 area code is located in the Central timezone. The Central time zone is also known as America/Chicago

area code 331

331 area code map

Top 4 Counties in Area Code 331

CountyTotal Population% of 331% of County
DuPage, IL916,92436%100%
Kane, IL515,26933%59%
Kendall, IL114,73620%58%
Will, IL677,5606%6%

Top 50 Cities in Area Code 331

CityTotal Population% of 331% of City
Aurora, IL197,8995%100%
Naperville, IL141,8534%100%
Bolingbrook, IL73,3662%91%
Wheaton, IL52,8941%100%
Downers Grove, IL47,8332%100%
Elmhurst, IL44,1211%100%
Lombard, IL43,1651%100%
Carol Stream, IL39,7111%100%
Bartlett, IL41,2082%94%
Streamwood, IL39,8581%97%
Hanover Park, IL37,9731%100%
Addison, IL36,9421%100%
Glendale Heights, IL34,2081%100%
St. Charles, IL32,9742%100%
Woodridge, IL32,9711%100%
Oswego, IL30,3552%100%
Glen Ellyn, IL27,4501%100%
West Chicago, IL27,0862%100%
Batavia, IL26,0451%100%
Westmont, IL24,6851%100%
Roselle, IL22,7631%100%
Lisle, IL22,3901%100%
Darien, IL22,0861%100%
Bloomingdale, IL22,0181%100%
Villa Park, IL21,9041%100%
Geneva, IL21,4951%100%
Montgomery, IL18,4381%100%
Bensenville, IL18,3521%99%
North Aurora, IL16,7601%100%
Hinsdale, IL16,8160%98%
Yorkville, IL16,9212%96%
Lemont, IL16,0001%100%
Wood Dale, IL13,7701%100%
Warrenville, IL13,1401%100%
Plano, IL10,8561%100%
Burr Ridge, IL10,5591%99%
Campton Hills, IL11,1312%82%
Winfield, IL9,0800%100%
Sugar Grove, IL8,9971%100%
Itasca, IL8,6491%100%
Willowbrook, IL8,5400%100%
Clarendon Hills, IL8,4270%100%
Joliet, IL147,4330%6%
Boulder Hill, IL8,1080%100%
Plainfield, IL39,5811%20%
Oak Brook, IL7,8831%99%
Elburn, IL5,6020%100%
Romeoville, IL39,6800%9%
Wayne, IL2,4311%99%
Oakbrook Terrace, IL2,1340%100%

Largest Landline Carriers in area code331

PrefixesCarrier
5%Peerless Network
3%Level 3
3%Mci Worldcom
3%Ameritech
3%Local Access
3%Verizon Wireless
1%Broadvox-clec
11%Other

Largest Wireless Carriers in area code331

PrefixesCarrier
20%Verizon Wireless
15%Sprint
11%T-mobile
8%Cricket
4%Cingular
3%Bandwidthcom Clec
1%Level 3
1%Other

Prefixes in area code331

PrefixUsagePrimary CityCarrierIntroduced
(331) 200-wirelessBartlettT-mobile USA07/11/2011
(331) 201-wirelessDowners GroveVerizon Wireless01/06/2012
(331) 202-wirelessElmhurstSprint01/17/2012
(331) 203-wirelessAuroraSprint10/12/2011
(331) 204-landlineBartlettBroadvox-clec07/29/2013
(331) 205-wirelessAuroraT-mobile USA10/21/2011
(331) 206-wirelessAuroraSprint10/12/2011
(331) 207-landlineYorkvilleLevel 3 Comms11/01/2011
(331) 208-wirelessAuroraSprint11/08/2011
(331) 209-wirelessElmhurstLevel 3 Comms01/17/2012
(331) 210-landlineSaint CharlesPeerless Network03/06/2012
(331) 212-landlineAuroraMci Worldcom Comms04/05/2012
(331) 213-wirelessNapervilleVerizon Wireless09/06/2011
(331) 214-wirelessDowners GroveVerizon Wireless06/20/2012
(331) 215-wirelessNapervilleVerizon Wireless09/28/2012
(331) 216-wirelessOswegoCingular Wireless10/31/2012
(331) 218-wirelessWheatonT-mobile USA07/09/2013
(331) 220-wirelessAuroraSprint07/12/2011
(331) 221-landlineElmhurst01/21/2009
(331) 222-wirelessSaint CharlesCricket Comms10/28/2008
(331) 223-wirelessSaint CharlesCricket Comms10/28/2008
(331) 225-wirelessElmhurstSprint08/22/2011
(331) 228-wirelessSaint CharlesOvation Comms09/21/2011
(331) 229-wirelessNapervilleVerizon Wireless11/27/2012
(331) 234-wirelessSugar GroveVerizon Wireless07/08/2013
(331) 240-landlineWest ChicagoPeerless Network04/10/2013
(331) 245-wirelessBartlettT-mobile USA04/18/2013
(331) 248-landlineGenevaComcast Phone Of Illinois DBA Comco07/06/2007
(331) 250-wirelessAuroraT-mobile USA04/10/2012
(331) 251-wirelessDowners GroveVerizon Wireless12/05/2012
(331) 254-wirelessT-mobile USA07/16/2014
(331) 256-wirelessAuroraVerizon Wireless09/13/2011
(331) 262-wirelessAuroraSprint07/30/2008
(331) 281-landlineNaperville10/25/2012
(331) 301-landlineAuroraLocal Access03/13/2013
(331) 302-wirelessAuroraVerizon Wireless02/11/2013
(331) 303-landlineElburnCibolo Creek Ventures DBA Routepoint Comm Il04/22/2013
(331) 305-wirelessNapervilleVerizon Wireless08/15/2013
(331) 318-landlineLemontLocal Access08/01/2013
(331) 330-landlineOswegoCricket Comms08/19/2008
(331) 332-wirelessNapervilleCricket Comms11/03/2008
(331) 333-wirelessNapervilleCricket Comms11/03/2008
(331) 422-landlineSaint CharlesLevel 3 Comms11/13/2008
(331) 425-wirelessAuroraT-mobile USA07/11/2007
(331) 431-wirelessAuroraBandwidth.com05/26/2010
(331) 442-wirelessSaint CharlesVerizon Wireless10/30/2008
(331) 444-landlineNapervilleVerizon Wireless08/04/2010
(331) 452-wirelessAuroraVerizon Wireless09/20/2007
(331) 454-wirelessAuroraCricket Comms05/07/2009
(331) 456-landlineRoselleFirst Comms12/05/2007
(331) 457-wirelessNapervilleVerizon Wireless11/14/2008
(331) 462-landlineLombardXo Illinois08/23/2008
(331) 465-wirelessWest ChicagoCingular Wireless10/17/2007
(331) 472-wirelessNapervilleT-mobile USA10/22/2008
(331) 481-wirelessDowners GroveVerizon Wireless10/29/2008
(331) 551-wirelessLombardCricket Comms11/05/2008
(331) 575-wirelessAuroraSprint09/18/2007
(331) 588-wirelessSaint CharlesCingular Wireless02/15/2010
(331) 625-wirelessDowners GroveVerizon Wireless10/16/2009
(331) 642-wirelessElmhurstBandwidth.com06/19/2008
(331) 643-wirelessAuroraSprint09/18/2007
(331) 645-wirelessElmhurstSprint11/05/2007
(331) 684-landlineAuroraSigecom07/12/2007
(331) 702-landlineNapervilleMci Worldcom Comms10/23/2013
(331) 703-wirelessWest ChicagoT-mobile USA10/24/2013
(331) 725-landlineOswegoCingular Wireless05/19/2009
(331) 777-landlineDowners GroveVerizon Wireless09/22/2010
(331) 801-wirelessTeleport Comms America05/15/2014
(331) 803-landlineLemontPeerless Network04/10/2013
(331) 825-wirelessDigital Network Access Comms11/08/2007
(331) 826-wirelessElmhurstSprint11/18/2008
(331) 888-landlineWarrenvillePeerless Network09/24/2010
(331) 903-wirelessSbc Internet Services05/15/2014
(331) 999-landlineOswegoBandwidth.com09/22/2010