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Phone Directory 312-821 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 821-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-821 Chicago, IL Mci Worldcom Communications Cook Landline 01/25/1998

Other Series For Prefixes

312-8210###
312-8211###
312-8212###
312-8213###
312-8214###
312-8215###
312-8216###
312-8217###
312-8218###
312-8219###