List of Cities in the 331 Area Code
Bartlett - 331-200
Downers Grove - 331-201
Elmhurst - 331-202
Aurora - 331-203
Aurora - 331-205
Aurora - 331-206
Yorkville - 331-207
Aurora - 331-208
Elmhurst - 331-209
Saint Charles - 331-210
Aurora - 331-212
Naperville - 331-213
Downers Grove - 331-214
Naperville - 331-215
Oswego - 331-216
Wheaton - 331-218
Aurora - 331-220
Elmhurst - 331-221
Saint Charles - 331-222
Saint Charles - 331-223
Elmhurst - 331-225
SUGAR GROVE - 331-227
Saint Charles - 331-228
Naperville - 331-229
Sugar Grove - 331-234
West Chicago - 331-240
Bartlett - 331-245
Geneva - 331-248
Aurora - 331-250
Downers Grove - 331-251
Lemont - 331-253
Sugar Grove - 331-254
Aurora - 331-256
Aurora - 331-262
Saint Charles - 331-276
Naperville - 331-281
Aurora - 331-301
Aurora - 331-302
Elburn - 331-303
Bartlett - 331-304
Naperville - 331-305
Lombard - 331-307
Bartlett - 331-308
Big Rock - 331-310
Lemont - 331-318
Aurora - 331-321
Naperville - 331-330
Naperville - 331-332
Naperville - 331-333
Saint Charles - 331-422
Aurora - 331-425
Aurora - 331-431
Saint Charles - 331-442
Naperville - 331-444
Aurora - 331-452
Aurora - 331-454
Roselle - 331-456
Naperville - 331-457
Lombard - 331-462
West Chicago - 331-465
Naperville - 331-472
Downers Grove - 331-481
Lombard - 331-551
NA - 331-552
NA - 331-553
Aurora - 331-575
Saint Charles - 331-588
ELMHURST - 331-591
Downers Grove - 331-625
Elmhurst - 331-642
Aurora - 331-643
Elmhurst - 331-645
Aurora - 331-684
Naperville - 331-701
Naperville - 331-702
West Chicago - 331-703
Kaneville - 331-704
Oswego - 331-725
Downers Grove - 331-777
Downers Grove - 331-801
Lemont - 331-803
Wheaton - 331-806
Plano - 331-808
Naperville - 331-814
GENEVA - 331-825
Elmhurst - 331-826
Warrenville - 331-888
Saint Charles - 331-901
Downers Grove - 331-903
Elmhurst - 331-979
Aurora - 331-980
Downers Grove - 331-998
Oswego - 331-999