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Phone Directory 312-931 Detail

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Illinois Chicago Central

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Example: (312) 931-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-931 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-9310###
312-9311###
312-9312###
312-9313###
312-9314###
312-9315###
312-9316###
312-9317###
312-9318###
312-9319###