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Phone Directory 312-850 Detail

State Major City Time Zone
Illinois Chicago Central

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-850 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-8500###
312-8501###
312-8502###
312-8503###
312-8504###
312-8505###
312-8506###
312-8507###
312-8508###
312-8509###