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Phone Directory 312-557 Detail

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Illinois Chicago Central

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Example: (312) 557-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-557 Chicago, IL Ameritech Illinois Cook Landline 11/11/2003

Other Series For Prefixes

312-5570###
312-5571###
312-5572###
312-5573###
312-5574###
312-5575###
312-5576###
312-5577###
312-5578###
312-5579###