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Phone Directory 312-731 Detail

State Major City Time Zone
Illinois Chicago Central

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-731 Chicago, IL T-mobile Usa Cook Landline 01/25/1998

Other Series For Prefixes

312-7310###
312-7311###
312-7312###
312-7313###
312-7314###
312-7315###
312-7316###
312-7317###
312-7318###
312-7319###