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Phone Directory 312-740 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 740-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-740 Chicago, IL American Messaging (am) Cook Cell Number 04/13/2001

Other Series For Prefixes

312-7400###
312-7401###
312-7402###
312-7403###
312-7404###
312-7405###
312-7406###
312-7407###
312-7408###
312-7409###