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Phone Directory 312-770 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 770-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-770 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-7700###
312-7701###
312-7702###
312-7703###
312-7704###
312-7705###
312-7706###
312-7707###
312-7708###
312-7709###