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Phone Directory 312-478 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 478-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-478 Chicago, IL T-mobile Usa Cook Landline 03/20/2014

Other Series For Prefixes

312-4780###
312-4781###
312-4782###
312-4783###
312-4784###
312-4785###
312-4786###
312-4787###
312-4788###
312-4789###