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Phone Directory 312-840 Detail

State Major City Time Zone
Illinois Chicago Central

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-840 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-8400###
312-8401###
312-8402###
312-8403###
312-8404###
312-8405###
312-8406###
312-8407###
312-8408###
312-8409###