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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 October 07, 2007 and is an overlay code part of overlay complex 630/331 (overlaying area codes cover the same geographic area).

09:52:45 PM 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
331-200 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
331-218 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
331-225 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
331-259 Sugar Grove
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
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
331-299 Hinsdale 1/4/2021
331-300 Aurora 3/17/2016
331-301 Aurora 3/13/2013
331-302 Aurora 2/11/2013
331-303 Elburn
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
331-345 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
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
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
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
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
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
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
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
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
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
  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
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
  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 09:52:45 PM).

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