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Phone Directory 312-670 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 670-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-670 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-6700###
312-6701###
312-6702###
312-6703###
312-6704###
312-6705###
312-6706###
312-6707###
312-6708###
312-6709###