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Illinois (331):
All telephone exchanges for area code: 331 Unknown, IL
331-211
331-221
331-222
331-223
331-248
331-262
331-311
331-330
331-332
331-333
331-411
331-422
331-425
331-442
331-452
331-454
331-456
331-457
331-462
331-465
331-472
331-481
331-511
331-551
331-555
331-575
331-591
331-611
331-625
331-642
331-643
331-645
331-684
331-700
331-711
331-725
331-811
331-825
331-826
331-911
331-950
331-958
331-959
331-976