AreaCodeLocations.info
Share

Area Code 331

Area code 331 is in Illinois, USA, spanning 5 counties and serving 53 cities, including Aurora, Wheaton or Downers Grove; it currently uses 207 prefixes, assigned from 331-200-XXXX through 331-999-XXXX.

In service since October 07, 2007, area code 331 is an overlay Numbering Plan Area, part of overlay complex 630/331.

The current local time is 04:48:17 PM (Central Time Zone).

Reverse phone lookup

Sponsored

Map of area code 331

More Illinois area codes

331 area code prefix 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
331-297 Batavia 08/09/2023
331-298 Naperville 08/09/2023
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
331-306 Downers Grove 09/19/2023
331-307 Lombard 10/13/2014
331-308 Bartlett 12/23/2014
331-309 Lemont 09/26/2023
331-310 Big Rock 12/29/2014
331-312 Aurora 11/06/2023
331-313 Naperville 8/16/2022
331-314 St Charles 11/17/2023
331-315 Lombard 8/8/2016
331-316 Naperville 01/04/2024
331-317 Hinsdale 01/05/2024
331-318 Lemont 8/1/2013
331-319 Aurora 01/24/2024
331-320 Bartlett 01/30/2024
331-321 Aurora 7/20/2015
331-322 Lombard 02/08/2024
331-323 Glen Ellyn 02/08/2024
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
  1. 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.
  2. Assignment date. N/A - mostly central office codes assigned before 2001.
Top

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
  1. Listed above are most places served by USA area code 331. When multiple places in a US state share the same name we list the largest one only. Cities with population over 50,000 are displayed in bold text.
  2. C stands for Central Time Zone (currently 04:48:17 PM).
Top