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Phone Directory 312-831 Detail

State Major City Time Zone
Illinois Chicago Central

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-831 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-8310###
312-8311###
312-8312###
312-8313###
312-8314###
312-8315###
312-8316###
312-8317###
312-8318###
312-8319###