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Phone Directory 312-409 Detail

State Major City Time Zone
Illinois Chicago Central

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-409 Chicago, IL Ameritech Illinois Cook Landline 09/11/1994

Other Series For Prefixes

312-4090###
312-4091###
312-4092###
312-4093###
312-4094###
312-4095###
312-4096###
312-4097###
312-4098###
312-4099###