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Phone Directory 312-421 Detail

State Major City Time Zone
Illinois Chicago Central

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-421 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-4210###
312-4211###
312-4212###
312-4213###
312-4214###
312-4215###
312-4216###
312-4217###
312-4218###
312-4219###