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331 area code

Area code 331 is in Illinois (IL), USA and some of the main locations covered are Aurora, Wheaton, Downers Grove, .. (jump to city list below).

Area code 331 has been in service since 07 October 2007 and is an overlay code part of overlay complex 630/331 (overlaying area codes cover the same geographic area).

08:51:51 AM is the current time in area code 331 (Central Time).

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Map of area code 331

More Illinois area codes

NPANXX1 Area served2 Date3
331-200Bartlett7/11/2011
331-201Downers Grove1/6/2012
331-202Elmhurst1/17/2012
331-203Aurora10/12/2011
331-204Naperville12/10/2015
331-205Aurora10/21/2011
331-206Aurora10/12/2011
331-207Yorkville11/1/2011
331-208Aurora11/8/2011
331-209Elmhurst1/17/2012
331-210St Charles3/6/2012
331-212Aurora4/5/2012
331-213Naperville9/6/2011
331-214Downers Grove6/20/2012
331-215Naperville9/28/2012
331-216Oswego10/31/2012
331-218Wheaton7/9/2013
331-219Aurora3/16/2017
331-220Aurora7/12/2011
331-221Elmhurst1/21/2009
331-222St Charles10/28/2008
331-223St Charles10/28/2008
331-225Elmhurst8/22/2011
331-226Naperville3/20/2017
331-227Sugar Grove5/17/2016
331-228St Charles9/21/2011
331-229Naperville11/27/2012
331-230Aurora4/5/2017
331-231Naperville8/7/2017
331-232West Chicago8/8/2017
331-233Downers Grove3/13/2017
331-234Sugar Grove7/8/2013
331-235St Charles10/17/2017
331-236Wheaton4/5/2017
331-237Naperville11/7/2017
331-238Downers Grove12/19/2017
331-239Yorkville8/27/2018
331-240West Chicago4/10/2013
331-241Lombard10/16/2018
331-242Lombard10/19/2018
331-243Lombard10/19/2018
331-244Naperville9/21/2017
331-245Bartlett4/18/2013
331-246Lemont10/19/2018
331-247Naperville11/21/2018
331-248Geneva7/6/2007
331-249Naperville12/5/2018
331-250Aurora4/10/2012
331-251Downers Grove12/5/2012
331-252Warrenville6/2/2016
331-253Lemont10/27/2014
331-254Sugar Grove7/16/2014
331-255Aurora8/22/2017
331-256Aurora9/13/2011
331-257Aurora1/17/2020
331-258Aurora
331-259Sugar Grove
331-260Downers Grove2/25/2019
331-261Lemont6/20/2019
331-262Aurora7/30/2008
331-263Itasca3/11/2016
331-264Hinsdale3/6/2020
331-265Geneva
331-266St Charles4/10/2020
331-267Lombard9/18/2020
331-268Sugar Grove1/14/2021
331-269Aurora5/14/2021
331-270Aurora7/20/2021
331-271Hinsdale10/21/2020
331-272St Charles7/15/2021
331-273Lemont6/9/2021
331-274Aurora8/3/2021
331-275Bartlett8/3/2021
331-276St Charles11/10/2014
331-277Lombard8/6/2021
331-278Aurora8/13/2021
331-279Elmhurst10/15/2021
331-280Downers Grove 12/29/2021
331-281Naperville10/25/2012
331-282Hinsdale 12/10/2021
331-283Geneva 2/23/2022
331-284Bartlett 3/11/2022
331-285Naperville 5/4/2022
331-288Elburn 2/17/2022
331-299Hinsdale1/4/2021
331-300Aurora3/17/2016
331-301Aurora3/13/2013
331-302Aurora2/11/2013
331-303Elburn
331-304Bartlett2/20/2015
331-305Naperville8/15/2013
331-307Lombard10/13/2014
331-308Bartlett12/23/2014
331-310Big Rock12/29/2014
331-315Lombard8/8/2016
331-318Lemont8/1/2013
331-321Aurora7/20/2015
331-330Naperville8/19/2008
331-332Naperville11/3/2008
331-333Naperville11/3/2008
331-334Batavia6/2/2021
331-336Aurora10/11/2019
331-341Plano3/30/2021
331-345Naperville11/18/2020
331-348Elburn10/11/2019
331-356Bartlett10/10/2019
331-373Oswego 2/25/2022
331-385Aurora9/28/2016
331-388Sugar Grove1/25/2021
331-399Downers Grove1/22/2021
331-400Oswego8/8/2019
331-401Naperville12/14/2015
331-422St Charles11/13/2008
331-425Aurora7/11/2007
331-426Lemont 2/18/2022
331-431Aurora5/26/2010
331-442St Charles10/30/2008
331-444Naperville8/4/2010
331-452Aurora9/20/2007
331-454Aurora5/7/2009
331-456Roselle12/5/2007
331-457Naperville11/14/2008
331-462Lombard8/23/2008
331-465West Chicago10/17/2007
331-466Glen Ellyn 2/17/2022
331-472Naperville10/22/2008
331-481Downers Grove10/29/2008
331-500Geneva1/4/2021
331-529Naperville8/8/2019
331-551Lombard11/5/2008
331-575Aurora9/18/2007
331-588St Charles2/15/2010
331-600Wheaton8/8/2019
331-625Downers Grove10/16/2009
331-627Lombard 2/25/2022
331-642Elmhurst
331-643Aurora9/18/2007
331-645Elmhurst11/5/2007
331-666Aurora9/29/2017
331-684Aurora7/12/2007
331-688Naperville 2/17/2022
331-701Naperville12/11/2014
331-702Naperville10/23/2013
331-703West Chicago10/24/2013
331-704Kaneville4/21/2015
331-707Aurora8/23/2016
331-716Wheaton1/18/2016
331-717Oswego1/18/2016
331-725Oswego
331-732Geneva10/11/2019
331-746Kaneville 2/17/2022
331-757Lemont7/13/2016
331-758Aurora10/27/2021
331-771St Charles2/10/2016
331-775Downers Grove1/4/2016
331-777Downers Grove9/22/2010
331-788Geneva1/25/2021
331-800West Chicago9/29/2017
331-801Downers Grove5/15/2014
331-803Lemont4/10/2013
331-806Wheaton6/11/2015
331-808Plano6/5/2015
331-814Naperville6/25/2015
331-825Geneva
331-826Elmhurst11/18/2008
331-837West Chicago 1/7/2022
331-850Big Rock3/30/2021
331-866Wheaton 1/13/2022
331-867Yorkville7/14/2020
331-871West Chicago2/17/2016
331-888Warrenville9/24/2010
331-899Lombard12/22/2020
331-900Elmhurst8/8/2019
331-901St Charles4/23/2015
331-903Downers Grove5/15/2014
331-946Glen Ellyn7/14/2020
331-979Elmhurst3/3/2015
331-980Aurora10/13/2014
331-998Downers Grove9/16/2015
331-999Oswego9/22/2010
  1. The NPA is the Numbering Plan Area (area code) and NXX is the central office code.
  2. For 'Area served' we list the rate center. In the North American Numbering Plan a rate center is a geographic area used to determine local calling boundaries for billing purposes. Its name is generally a locality, often not the only one served by an NPA-NXX combination.
  3. The assignment date. If no date is shown the exchange code was assigned before 2001.

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List of cities in area code 331

City4 County Time5
AddisonDupage C
AuroraKane C
BartlettDupage C
BataviaKane C
BensenvilleDupage C
Big RockKane C
BloomingdaleDupage C
BolingbrookWill C
BristolKendall C
Carol StreamDupage C
Clarendon HillsDupage C
DarienDupage C
Downers GroveDupage C
ElburnKane C
ElmhurstDupage C
EolaDupage C
Fox ValleyDupage C
GenevaKane C
Glen EllynDupage C
Glendale HeightsDupage C
Hanover ParkCook C
HinsdaleDupage C
ItascaDupage C
KanevilleKane C
LafoxKane C
LemontCook C
LisleDupage C
LombardDupage C
MedinahDupage C
MillbrookKendall C
MontgomeryKendall C
MooseheartKane C
NapervilleWill C
North AuroraKane C
Oak BrookDupage C
OswegoKendall C
PlanoKendall C
RoselleDupage C
St CharlesKane C
StreamwoodCook C
Sugar GroveKane C
Villa ParkDupage C
WarrenvilleDupage C
WascoKane C
WayneDupage C
West ChicagoDupage C
WestmontDupage C
WheatonDupage C
WillowbrookDupage C
WinfieldDupage C
Wood DaleDupage C
WoodridgeDupage C
YorkvilleKendall C
  1. Listed in the table above are most, often not all places served by area code 331. When two or more places with the same name are located in the same state we list the largest one only. Cities with population over 50,000 are displayed in bold text.
  2. C stands for Central Time (currently 08:51:51 AM).

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