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Phone Directory 312-431 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 431-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-431 Chicago, IL Ameritech Illinois Cook Landline 10/11/1997

Other Series For Prefixes

312-4310###
312-4311###
312-4312###
312-4313###
312-4314###
312-4315###
312-4316###
312-4317###
312-4318###
312-4319###