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Phone Directory 312-942 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 942-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-942 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-9420###
312-9421###
312-9422###
312-9423###
312-9424###
312-9425###
312-9426###
312-9427###
312-9428###
312-9429###