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331 Area Code

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

In service since October 07, 2007, area code 331 is an overlay Numbering Plan Area, part of overlay complex 630/331 (overlaying NPAs cover the same area).

The current time for places served by area code 331 is 07:15:24 PM (Central Time Zone).

Reverse phone lookup

Map of area code 331

More Illinois area codes

331 phone number location

NPANXX	Area served¹	Date²
331-200	Bartlett	7/11/2011
331-201	Downers Grove	1/6/2012
331-202	Elmhurst	1/17/2012
331-203	Aurora	10/12/2011
331-204	Naperville	12/10/2015
331-205	Aurora	10/21/2011
331-206	Aurora	10/12/2011
331-207	Yorkville	11/1/2011
331-208	Aurora	11/8/2011
331-209	Elmhurst	1/17/2012
331-210	St Charles	3/6/2012
331-212	Aurora	4/5/2012
331-213	Naperville	9/6/2011
331-214	Downers Grove	6/20/2012
331-215	Naperville	9/28/2012
331-216	Oswego	10/31/2012
331-217	Lombard	07/11/2023
331-218	Wheaton	7/9/2013
331-219	Aurora	3/16/2017
331-220	Aurora	7/12/2011
331-221	Elmhurst	1/21/2009
331-222	St Charles	10/28/2008
331-223	St Charles	10/28/2008
331-224	Itasca	06/05/2023
331-225	Elmhurst	8/22/2011
331-226	Naperville	3/20/2017
331-227	Sugar Grove	5/17/2016
331-228	St Charles	9/21/2011
331-229	Naperville	11/27/2012
331-230	Aurora	4/5/2017
331-231	Naperville	8/7/2017
331-232	West Chicago	8/8/2017
331-233	Downers Grove	3/13/2017
331-234	Sugar Grove	7/8/2013
331-235	St Charles	10/17/2017
331-236	Wheaton	4/5/2017
331-237	Naperville	11/7/2017
331-238	Downers Grove	12/19/2017
331-239	Yorkville	8/27/2018
331-240	West Chicago	4/10/2013
331-241	Lombard	10/16/2018
331-242	Lombard	10/19/2018
331-243	Lombard	10/19/2018
331-244	Naperville	9/21/2017
331-245	Bartlett	4/18/2013
331-246	Lemont	10/19/2018
331-247	Naperville	11/21/2018
331-248	Geneva	7/6/2007
331-249	Naperville	12/5/2018
331-250	Aurora	4/10/2012
331-251	Downers Grove	12/5/2012
331-252	Warrenville	6/2/2016
331-253	Lemont	10/27/2014
331-254	Sugar Grove	7/16/2014
331-255	Aurora	8/22/2017
331-256	Aurora	9/13/2011
331-257	Aurora	1/17/2020
331-258	Aurora	N/A
331-259	Sugar Grove	N/A
331-260	Downers Grove	2/25/2019
331-261	Lemont	6/20/2019
331-262	Aurora	7/30/2008
331-263	Itasca	3/11/2016
331-264	Hinsdale	3/6/2020
331-265	Geneva	N/A
331-266	St Charles	4/10/2020
331-267	Lombard	9/18/2020
331-268	Sugar Grove	1/14/2021
331-269	Aurora	5/14/2021
331-270	Aurora	7/20/2021
331-271	Hinsdale	10/21/2020
331-272	St Charles	7/15/2021
331-273	Lemont	6/9/2021
331-274	Aurora	8/3/2021
331-275	Bartlett	8/3/2021
331-276	St Charles	11/10/2014
331-277	Lombard	8/6/2021
331-278	Aurora	8/13/2021
331-279	Elmhurst	10/15/2021
331-280	Downers Grove	12/29/2021
331-281	Naperville	10/25/2012
331-282	Hinsdale	12/10/2021
331-283	Geneva	2/23/2022
331-284	Bartlett	3/11/2022
331-285	Naperville	5/4/2022
331-286	St Charles	7/15/2022
331-287	Aurora	7/20/2022
331-288	Elburn	2/17/2022
331-289	Hinsdale	8/12/2022
331-290	Aurora	8/26/2022
331-291	Downers Grove	8/26/2022
331-292	Downers Grove	10/14/2022
331-293	Aurora	01/10/2023
331-294	Naperville	01/12/2023
331-295	Aurora	02/07/2023
331-296	Wheaton	04/18/2023
331-299	Hinsdale	1/4/2021

NPANXX	Area served¹	Date²
331-300	Aurora	3/17/2016
331-301	Aurora	3/13/2013
331-302	Aurora	2/11/2013
331-303	Elburn	N/A
331-304	Bartlett	2/20/2015
331-305	Naperville	8/15/2013
331-307	Lombard	10/13/2014
331-308	Bartlett	12/23/2014
331-310	Big Rock	12/29/2014
331-313	Naperville	8/16/2022
331-315	Lombard	8/8/2016
331-318	Lemont	8/1/2013
331-321	Aurora	7/20/2015
331-330	Naperville	8/19/2008
331-332	Naperville	11/3/2008
331-333	Naperville	11/3/2008
331-334	Batavia	6/2/2021
331-336	Aurora	10/11/2019
331-341	Plano	3/30/2021
331-343	Downers Grove	01/13/2023
331-345	Naperville	11/18/2020
331-348	Elburn	10/11/2019
331-356	Bartlett	10/10/2019
331-373	Oswego	2/25/2022
331-385	Aurora	9/28/2016
331-388	Sugar Grove	1/25/2021
331-399	Downers Grove	1/22/2021

NPANXX	Area served¹	Date²
331-400	Oswego	8/8/2019
331-401	Naperville	12/14/2015
331-422	St Charles	11/13/2008
331-425	Aurora	7/11/2007
331-426	Lemont	2/18/2022
331-431	Aurora	5/26/2010
331-442	St Charles	10/30/2008
331-444	Naperville	8/4/2010
331-452	Aurora	9/20/2007
331-454	Aurora	5/7/2009
331-456	Roselle	12/5/2007
331-457	Naperville	11/14/2008
331-462	Lombard	8/23/2008
331-465	West Chicago	10/17/2007
331-466	Glen Ellyn	2/17/2022
331-472	Naperville	10/22/2008
331-481	Downers Grove	10/29/2008

NPANXX	Area served¹	Date²
331-500	Geneva	1/4/2021
331-529	Naperville	8/8/2019
331-551	Lombard	11/5/2008
331-575	Aurora	9/18/2007
331-588	St Charles	2/15/2010

NPANXX	Area served¹	Date²
331-600	Wheaton	8/8/2019
331-625	Downers Grove	10/16/2009
331-627	Lombard	2/25/2022
331-631	Downers Grove	7/7/2022
331-642	Elmhurst	N/A
331-643	Aurora	9/18/2007
331-645	Elmhurst	11/5/2007
331-666	Aurora	9/29/2017
331-684	Aurora	7/12/2007
331-688	Naperville	2/17/2022

NPANXX	Area served¹	Date²
331-701	Naperville	12/11/2014
331-702	Naperville	10/23/2013
331-703	West Chicago	10/24/2013
331-704	Kaneville	4/21/2015
331-707	Aurora	8/23/2016
331-716	Wheaton	1/18/2016
331-717	Oswego	1/18/2016
331-725	Oswego	N/A
331-732	Geneva	10/11/2019
331-746	Kaneville	2/17/2022
331-757	Lemont	7/13/2016
331-758	Aurora	10/27/2021
331-771	St Charles	2/10/2016
331-775	Downers Grove	1/4/2016
331-777	Downers Grove	9/22/2010
331-788	Geneva	1/25/2021

NPANXX	Area served¹	Date²
331-800	West Chicago	9/29/2017
331-801	Downers Grove	5/15/2014
331-803	Lemont	4/10/2013
331-806	Wheaton	6/11/2015
331-808	Plano	6/5/2015
331-814	Naperville	6/25/2015
331-825	Geneva	N/A
331-826	Elmhurst	11/18/2008
331-837	West Chicago	1/7/2022
331-850	Big Rock	3/30/2021
331-866	Wheaton	1/13/2022
331-867	Yorkville	7/14/2020
331-871	West Chicago	2/17/2016
331-888	Warrenville	9/24/2010
331-899	Lombard	12/22/2020

NPANXX	Area served¹	Date²
331-900	Elmhurst	8/8/2019
331-901	St Charles	4/23/2015
331-903	Downers Grove	5/15/2014
331-946	Glen Ellyn	7/14/2020
331-979	Elmhurst	3/3/2015
331-980	Aurora	10/13/2014
331-998	Downers Grove	9/16/2015
331-999	Oswego	9/22/2010

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.
Assignment date. N/A - mostly CO codes assigned before 2001.

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Cities in area code 331

City¹	County	Time²
Addison	Dupage	C
Aurora	Kane	C
Bartlett	Dupage	C
Batavia	Kane	C
Bensenville	Dupage	C
Big Rock	Kane	C
Bloomingdale	Dupage	C
Bolingbrook	Will	C
Bristol	Kendall	C
Carol Stream	Dupage	C
Clarendon Hills	Dupage	C
Darien	Dupage	C
Downers Grove	Dupage	C
Elburn	Kane	C
Elmhurst	Dupage	C
Eola	Dupage	C
Fox Valley	Dupage	C
Geneva	Kane	C
Glen Ellyn	Dupage	C
Glendale Heights	Dupage	C
Hanover Park	Cook	C
Hinsdale	Dupage	C
Itasca	Dupage	C
Kaneville	Kane	C
Lafox	Kane	C
Lemont	Cook	C
Lisle	Dupage	C
Lombard	Dupage	C
Medinah	Dupage	C
Millbrook	Kendall	C
Montgomery	Kendall	C
Mooseheart	Kane	C
Naperville	Will	C
North Aurora	Kane	C
Oak Brook	Dupage	C
Oswego	Kendall	C
Plano	Kendall	C
Roselle	Dupage	C
St Charles	Kane	C
Streamwood	Cook	C
Sugar Grove	Kane	C
Villa Park	Dupage	C
Warrenville	Dupage	C
Wasco	Kane	C
Wayne	Dupage	C
West Chicago	Dupage	C
Westmont	Dupage	C
Wheaton	Dupage	C
Willowbrook	Dupage	C
Winfield	Dupage	C
Wood Dale	Dupage	C
Woodridge	Dupage	C
Yorkville	Kendall	C

Listed above are most places served by area code 331. When multiple places in a state/province share the same name we list the largest one only. Cities with population over 50,000 are displayed in bold text.
C stands for Central Time Zone (currently 07:15:24 PM).

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331 Area Code

Reverse phone lookup

Map of area code 331

More Illinois area codes

331 phone number location

331-2XX-XXXX

331-3XX-XXXX

331-4XX-XXXX

331-5XX-XXXX

331-6XX-XXXX

331-9XX-XXXX

Cities in area code 331