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Phone Directory 312-640 Detail

State Major City Time Zone
Illinois Chicago Central

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-640 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-6400###
312-6401###
312-6402###
312-6403###
312-6404###
312-6405###
312-6406###
312-6407###
312-6408###
312-6409###