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Phone Directory 312-912 Detail

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Illinois Chicago Central

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Example: (312) 912-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-912 Chicago, IL Ameritech Illinois Cook Landline 09/11/1994

Other Series For Prefixes

312-9120###
312-9121###
312-9122###
312-9123###
312-9124###
312-9125###
312-9126###
312-9127###
312-9128###
312-9129###