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Phone Directory 312-400 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 400-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-400 Chicago, IL American Messaging (am) Cook Cell Number 04/13/2001

Other Series For Prefixes

312-4000###
312-4001###
312-4002###
312-4003###
312-4004###
312-4005###
312-4006###
312-4007###
312-4008###
312-4009###