331 Area Code: Location, Cities, Map And Time Zone

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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 221 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 .

331 area code location on a map
© OpenStreetMap contributorsFor exact NPA boundaries see official 331 area code map

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More Illinois area codes:

  • 217
  • 224
  • 309
  • 312
  • 447
  • 464
  • 618
  • 630
  • 708
  • 730
  • 773
  • 779
  • 815
  • 847
  • 861
  • 872

Locate any 331-NXX prefix:

331-200-XXXX --- 331-299-XXXX
NPANXX Area served[1] Provider[2] Date[3]
331-200 Bartlett Multiple 7/11/2011
331-201 Downers Grove Multiple 1/6/2012
331-202 Elmhurst Multiple 1/17/2012
331-203 Aurora Multiple 10/12/2011
331-204 Naperville Multiple 12/10/2015
331-205 Aurora Multiple 10/21/2011
331-206 Aurora Multiple 10/12/2011
331-207 Yorkville Multiple 11/1/2011
331-208 Aurora Multiple 11/8/2011
331-209 Elmhurst Multiple 1/17/2012
331-210 St Charles Multiple 3/6/2012
331-212 Aurora Multiple 4/5/2012
331-213 Naperville Multiple 9/6/2011
331-214 Downers Grove Multiple 6/20/2012
331-215 Naperville Multiple 9/28/2012
331-216 Oswego Multiple 10/31/2012
331-217 Lombard Multiple 07/11/2023
331-218 Wheaton Multiple 7/9/2013
331-219 Aurora Multiple 3/16/2017
331-220 Aurora Multiple 7/12/2011
331-221 Elmhurst Illinois Bell Tel Co 1/21/2009
331-222 St Charles Multiple 10/28/2008
331-223 St Charles Multiple 10/28/2008
331-224 Itasca Multiple 06/05/2023
331-225 Elmhurst Multiple 8/22/2011
331-226 Naperville Multiple 3/20/2017
331-227 Sugar Grove Multiple 5/17/2016
331-228 St Charles Multiple 9/21/2011
331-229 Naperville Multiple 11/27/2012
331-230 Aurora Multiple 4/5/2017
331-231 Naperville Multiple 8/7/2017
331-232 West Chicago Multiple 8/8/2017
331-233 Downers Grove Multiple 3/13/2017
331-234 Sugar Grove Multiple 7/8/2013
331-235 St Charles Multiple 10/17/2017
331-236 Wheaton Multiple 4/5/2017
331-237 Naperville Multiple 11/7/2017
331-238 Downers Grove Multiple 12/19/2017
331-239 Yorkville Multiple 8/27/2018
331-240 West Chicago Multiple 4/10/2013
331-241 Lombard Multiple 10/16/2018
331-242 Lombard T-Mobile USA 10/19/2018
331-243 Lombard Multiple 10/19/2018
331-244 Naperville Multiple 9/21/2017
331-245 Bartlett Multiple 4/18/2013
331-246 Lemont Multiple 10/19/2018
331-247 Naperville Multiple 11/21/2018
331-248 Geneva Multiple 7/6/2007
331-249 Naperville Multiple 12/5/2018
331-250 Aurora Multiple 4/10/2012
331-251 Downers Grove Multiple 12/5/2012
331-252 Warrenville Multiple 6/2/2016
331-253 Lemont Multiple 10/27/2014
331-254 Sugar Grove Multiple 7/16/2014
331-255 Aurora Multiple 8/22/2017
331-256 Aurora Multiple 9/13/2011
331-257 Aurora Multiple 1/17/2020
331-258 Aurora Multiple N/A
331-259 Sugar Grove Multiple N/A
331-260 Downers Grove Multiple 2/25/2019
331-261 Lemont Multiple 6/20/2019
331-262 Aurora Multiple 7/30/2008
331-263 Itasca Multiple 3/11/2016
331-264 Hinsdale Multiple 3/6/2020
331-265 Geneva Multiple N/A
331-266 St Charles Multiple 4/10/2020
331-267 Lombard Multiple 9/18/2020
331-268 Sugar Grove Multiple 1/14/2021
331-269 Aurora Multiple 5/14/2021
331-270 Aurora Multiple 7/20/2021
331-271 Hinsdale Multiple 10/21/2020
331-272 St Charles Multiple 7/15/2021
331-273 Lemont Multiple 6/9/2021
331-274 Aurora Multiple 8/3/2021
331-275 Bartlett T-Mobile USA 8/3/2021
331-276 St Charles Multiple 11/10/2014
331-277 Lombard Multiple 8/6/2021
331-278 Aurora Multiple 8/13/2021
331-279 Elmhurst Multiple 10/15/2021
331-280 Downers Grove Multiple 12/29/2021
331-281 Naperville Multiple 10/25/2012
331-282 Hinsdale Multiple 12/10/2021
331-283 Geneva Multiple 2/23/2022
331-284 Bartlett Multiple 3/11/2022
331-285 Naperville Multiple 5/4/2022
331-286 St Charles Multiple 7/15/2022
331-287 Aurora Multiple 7/20/2022
331-288 Elburn Multiple 2/17/2022
331-289 Hinsdale Multiple 8/12/2022
331-290 Aurora Multiple 8/26/2022
331-291 Downers Grove Multiple 8/26/2022
331-292 Downers Grove Multiple 10/14/2022
331-293 Aurora Multiple 01/10/2023
331-294 Naperville Multiple 01/12/2023
331-295 Aurora Multiple 02/07/2023
331-296 Wheaton Multiple 04/18/2023
331-297 Batavia Multiple 08/09/2023
331-298 Naperville Multiple 08/09/2023
331-299 Hinsdale Multiple 1/4/2021
331-300-XXXX --- 331-399-XXXX
NPANXX Area served[1] Provider[2] Date[3]
331-300 Aurora Multiple 3/17/2016
331-301 Aurora Multiple 3/13/2013
331-302 Aurora Multiple 2/11/2013
331-303 Elburn Multiple N/A
331-304 Bartlett Multiple 2/20/2015
331-305 Naperville Multiple 8/15/2013
331-306 Downers Grove Onvoy 09/19/2023
331-307 Lombard Multiple 10/13/2014
331-308 Bartlett Multiple 12/23/2014
331-309 Lemont Multiple 09/26/2023
331-310 Big Rock Multiple 12/29/2014
331-312 Aurora Multiple 11/06/2023
331-313 Naperville Multiple 8/16/2022
331-314 St Charles Multiple 11/17/2023
331-315 Lombard Multiple 8/8/2016
331-316 Naperville Multiple 01/04/2024
331-317 Hinsdale Multiple 01/05/2024
331-318 Lemont Multiple 8/1/2013
331-319 Aurora Multiple 01/24/2024
331-320 Bartlett Multiple 01/30/2024
331-321 Aurora Multiple 7/20/2015
331-322 Lombard Multiple 02/08/2024
331-323 Glen Ellyn Multiple 02/08/2024
331-324 Yorkville Onvoy 03/13/2024
331-325 Lemont Multiple 03/21/2024
331-326 Downers Grove Multiple 03/28/2024
331-327 St Charles Multiple 11/14/2024
331-328 Naperville Multiple 12/16/2024
331-329 Aurora Multiple 01/08/2025
331-330 Naperville Multiple 8/19/2008
331-331 Aurora Onvoy 08/21/2025
331-332 Naperville Multiple 11/3/2008
331-333 Naperville Multiple 11/3/2008
331-334 Batavia Multiple 6/2/2021
331-335 St Charles Multiple 04/30/2024
331-336 Aurora Multiple 10/11/2019
331-337 Oswego New Cingular Wireless PCS 01/09/2025
331-338 Aurora Multiple 01/29/2025
331-339 Aurora Multiple 08/28/2025
331-340 Itasca Onvoy 11/05/2025
331-341 Plano Multiple 3/30/2021
331-342 Naperville Multiple 11/18/2025
331-343 Downers Grove Multiple 01/13/2023
331-344 West Chicago Onvoy 02/02/2026
331-345 Naperville Multiple 11/18/2020
331-348 Elburn Multiple 10/11/2019
331-356 Bartlett Multiple 10/10/2019
331-373 Oswego Multiple 2/25/2022
331-385 Aurora Multiple 9/28/2016
331-388 Sugar Grove Multiple 1/25/2021
331-399 Downers Grove Multiple 1/22/2021
331-400-XXXX --- 331-481-XXXX
NPANXX Area served[1] Provider[2] Date[3]
331-400 Oswego Multiple 8/8/2019
331-401 Naperville Multiple 12/14/2015
331-422 St Charles Multiple 11/13/2008
331-425 Aurora Multiple 7/11/2007
331-426 Lemont Multiple 2/18/2022
331-431 Aurora Multiple 5/26/2010
331-442 St Charles Multiple 10/30/2008
331-444 Naperville Multiple 8/4/2010
331-452 Aurora Multiple 9/20/2007
331-454 Aurora Multiple 5/7/2009
331-456 Roselle First Communications 12/5/2007
331-457 Naperville Multiple 11/14/2008
331-462 Lombard Multiple 8/23/2008
331-465 West Chicago Multiple 10/17/2007
331-466 Glen Ellyn Multiple 2/17/2022
331-472 Naperville Multiple 10/22/2008
331-481 Downers Grove Multiple 10/29/2008
331-500-XXXX --- 331-588-XXXX
NPANXX Area served[1] Provider[2] Date[3]
331-500 Geneva Multiple 1/4/2021
331-529 Naperville Multiple 8/8/2019
331-551 Lombard Multiple 11/5/2008
331-575 Aurora Multiple 9/18/2007
331-588 St Charles New Cingular Wireless PCS 2/15/2010
331-600-XXXX --- 331-688-XXXX
NPANXX Area served[1] Provider[2] Date[3]
331-600 Wheaton Multiple 8/8/2019
331-625 Downers Grove Multiple 10/16/2009
331-627 Lombard Multiple 2/25/2022
331-631 Downers Grove Multiple 7/7/2022
331-642 Elmhurst Multiple N/A
331-643 Aurora Multiple 9/18/2007
331-645 Elmhurst Multiple 11/5/2007
331-666 Aurora Multiple 9/29/2017
331-684 Aurora Multiple 7/12/2007
331-688 Naperville Multiple 2/17/2022
331-701-XXXX --- 331-788-XXXX
NPANXX Area served[1] Provider[2] Date[3]
331-701 Naperville Multiple 12/11/2014
331-702 Naperville Multiple 10/23/2013
331-703 West Chicago Multiple 10/24/2013
331-704 Kaneville Multiple 4/21/2015
331-707 Aurora Multiple 8/23/2016
331-716 Wheaton Multiple 1/18/2016
331-717 Oswego Multiple 1/18/2016
331-725 Oswego Multiple N/A
331-732 Geneva Multiple 10/11/2019
331-746 Kaneville Multiple 2/17/2022
331-757 Lemont Multiple 7/13/2016
331-758 Aurora Multiple 10/27/2021
331-771 St Charles Multiple 2/10/2016
331-775 Downers Grove Multiple 1/4/2016
331-777 Downers Grove Multiple 9/22/2010
331-788 Geneva Multiple 1/25/2021
331-800-XXXX --- 331-899-XXXX
NPANXX Area served[1] Provider[2] Date[3]
331-800 West Chicago Multiple 9/29/2017
331-801 Downers Grove Multiple 5/15/2014
331-803 Lemont Multiple 4/10/2013
331-806 Wheaton Multiple 6/11/2015
331-808 Plano Multiple 6/5/2015
331-814 Naperville Multiple 6/25/2015
331-825 Geneva Digital Network Access Communications N/A
331-826 Elmhurst Multiple 11/18/2008
331-837 West Chicago Multiple 1/7/2022
331-850 Big Rock Multiple 3/30/2021
331-866 Wheaton Multiple 1/13/2022
331-867 Yorkville Multiple 7/14/2020
331-871 West Chicago Multiple 2/17/2016
331-888 Warrenville Multiple 9/24/2010
331-899 Lombard Multiple 12/22/2020
331-900-XXXX --- 331-999-XXXX
NPANXX Area served[1] Provider[2] Date[3]
331-900 Elmhurst Multiple 8/8/2019
331-901 St Charles Multiple 4/23/2015
331-903 Downers Grove Multiple 5/15/2014
331-946 Glen Ellyn Multiple 7/14/2020
331-979 Elmhurst Multiple 3/3/2015
331-980 Aurora T-Mobile USA 10/13/2014
331-998 Downers Grove Multiple 9/16/2015
331-999 Oswego Multiple 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. A single provider refers to the original company controlling a whole NPA-NXX block (10,000 phone numbers). With Number Pooling, NPA-NXX blocks can be split into ten 1,000 phone number blocks and handed over to other service providers (available in the USA and Puerto Rico).
  3. Assignment date. N/A: unavailable date or central office code assigned before 2001.
  4. NXX prefixes last updated: February 13, 2026

Cities in area code 331

City1 County Time zone1
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 (currently ).
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