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Phone Directory 312-427 Detail

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Illinois Chicago Central

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Example: (312) 427-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-427 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-4270###
312-4271###
312-4272###
312-4273###
312-4274###
312-4275###
312-4276###
312-4277###
312-4278###
312-4279###