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Phone Directory 312-923 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 923-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-923 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-9230###
312-9231###
312-9232###
312-9233###
312-9234###
312-9235###
312-9236###
312-9237###
312-9238###
312-9239###