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Phone Directory 312-970 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 970-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-970 Chicago, IL Ameritech Illinois Cook Landline 03/03/2001

Other Series For Prefixes

312-9700###
312-9701###
312-9702###
312-9703###
312-9704###
312-9705###
312-9706###
312-9707###
312-9708###
312-9709###