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Phone Directory 312-440 Detail

State Major City Time Zone
Illinois Chicago Central

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-440 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-4400###
312-4401###
312-4402###
312-4403###
312-4404###
312-4405###
312-4406###
312-4407###
312-4408###
312-4409###