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Phone Directory 312-957 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 957-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-957 Chicago, IL Ameritech Illinois Cook Landline 09/11/1994

Other Series For Prefixes

312-9570###
312-9571###
312-9572###
312-9573###
312-9574###
312-9575###
312-9576###
312-9577###
312-9578###
312-9579###