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Phone Directory 312-347 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 347-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-347 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-3470###
312-3471###
312-3472###
312-3473###
312-3474###
312-3475###
312-3476###
312-3477###
312-3478###
312-3479###