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Area Code 331 Information and Location Details

Area code 331 serves the state of Illinois. This area code was assigned on July 23rd, 1999. On October 7th, 2007 it went into service. 331 is a General Purpose Code. 331 service area does overlap with 630 area codes. Dialing pattern for local calls within the same NPA (area code) is 1+10D.

Area Code 331 Has 99 Exchanges

Exchange City
331-200 Bartlett
331-201 Downers Grove
331-202 Elmhurst
331-203 Aurora
331-204 Naperville
331-205 Aurora
331-206 Aurora
331-207 Yorkville
331-208 Aurora
331-209 Elmhurst
331-212 Aurora
331-213 Naperville
331-214 Downers Grove
331-215 Naperville
331-216 Oswego
331-218 Wheaton
331-219 Aurora
331-220 Aurora
331-221 Elmhurst
331-225 Elmhurst
331-226 Naperville
331-227 Sugar Grove
331-229 Naperville
331-230 Aurora
331-233 Downers Grove
331-234 Sugar Grove
331-236 Wheaton
331-240 West Chicago
331-245 Bartlett
331-248 Geneva
331-250 Aurora
331-251 Downers Grove
331-252 Warrenville
331-253 Lemont
331-254 Sugar Grove
331-256 Aurora
331-262 Aurora
331-263 Itasca
331-281 Naperville
331-300 Aurora
331-301 Aurora
331-302 Aurora
331-303 Elburn
331-304 Bartlett
331-305 Naperville
331-307 Lombard
331-308 Bartlett
331-310 Big Rock
331-315 Lombard
331-318 Lemont
331-321 Aurora
331-330 Naperville
331-332 Naperville
331-333 Naperville
331-385 Aurora
331-401 Naperville
331-425 Aurora
331-431 Aurora
331-444 Naperville
331-452 Aurora
331-454 Aurora
331-456 Roselle
331-457 Naperville
331-462 Lombard
331-465 West Chicago
331-472 Naperville
331-481 Downers Grove
331-551 Lombard
331-575 Aurora
331-625 Downers Grove
331-642 Elmhurst
331-643 Aurora
331-645 Elmhurst
331-684 Aurora
331-701 Naperville
331-702 Naperville
331-703 West Chicago
331-704 Kaneville
331-707 Aurora
331-716 Wheaton
331-717 Oswego
331-725 Oswego
331-757 Lemont
331-775 Downers Grove
331-777 Downers Grove
331-801 Downers Grove
331-803 Lemont
331-806 Wheaton
331-808 Plano
331-814 Naperville
331-825 Geneva
331-826 Elmhurst
331-871 West Chicago
331-888 Warrenville
331-903 Downers Grove
331-979 Elmhurst
331-980 Aurora
331-998 Downers Grove
331-999 Oswego