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Phone Directory 312-777 Detail

State Major City Time Zone
Illinois Chicago Central

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-777 Chicago, IL Teleport Communications America Cook Landline 01/25/1998

Other Series For Prefixes

312-7770###
312-7771###
312-7772###
312-7773###
312-7774###
312-7775###
312-7776###
312-7777###
312-7778###
312-7779###