Area Code 331 and Prefix Lookup

Prefix City
331-200 Hanover Park
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
331-210 Saint Charles
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
331-222 Saint Charles
331-223 Saint Charles
331-225 Elmhurst
331-226 Naperville
331-227 Sugar Grove
331-228 Saint Charles
331-229 Naperville
331-230 Aurora
331-231 Dupage
331-232 West Chicago
331-233 Downers Grove
331-234 Sugar Grove
331-236 Wheaton
331-240 West Chicago
331-244 Dupage
331-245 Hanover Park
331-248 Geneva
331-250 Aurora
331-251 Downers Grove
331-252 Warrenville
331-253 Lemont
331-254 Sugar Grove
331-255 Dupage
331-256 Aurora
331-262 Aurora
331-263 Bensenville
331-276 Saint Charles
331-281 Naperville
331-300 Aurora
331-301 Aurora
331-302 Aurora
331-303 Elburn
331-304 Hanover Park
331-305 Naperville
331-307 Lombard
331-308 Hanover Park
331-310 Big Rock
331-315 Lombard
331-318 Lemont
331-321 Aurora
331-330 Montgomery
331-332 Naperville
331-333 Naperville
331-385 Aurora
331-401 Naperville
331-422 Saint Charles
331-425 Aurora
331-431 Aurora
331-442 Saint Charles
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
331-588 Saint Charles
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 Sugar Grove
331-707 Aurora
331-716 Wheaton
331-717 Oswego
331-725 Oswego
331-757 Lemont
331-771 Saint Charles
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 Kane
331-826 Elmhurst
331-871 West Chicago
331-888 Warrenville
331-901 Saint Charles
331-903 Downers Grove
331-979 Elmhurst
331-980 Aurora
331-998 Downers Grove
331-999 Oswego
331-235 Geneva
331-237 Dupage
331-238
331-666 Aurora
331-800 West Chicago