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Phone Directory 312-993 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 993-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-993 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-9930###
312-9931###
312-9932###
312-9933###
312-9934###
312-9935###
312-9936###
312-9937###
312-9938###
312-9939###