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Phone Directory 312-857 Detail

State Major City Time Zone
Illinois Chicago Central

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-857 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-8570###
312-8571###
312-8572###
312-8573###
312-8574###
312-8575###
312-8576###
312-8577###
312-8578###
312-8579###