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Phone Directory 312-570 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 570-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-570 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-5700###
312-5701###
312-5702###
312-5703###
312-5704###
312-5705###
312-5706###
312-5707###
312-5708###
312-5709###