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Phone Directory 312-612 Detail

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Illinois Chicago Central

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Example: (312) 612-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-612 Chicago, IL Ameritech Illinois Cook Landline 10/31/2000

Other Series For Prefixes

312-6120###
312-6121###
312-6122###
312-6123###
312-6124###
312-6125###
312-6126###
312-6127###
312-6128###
312-6129###