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Phone Directory 312-551 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 551-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-551 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-5510###
312-5511###
312-5512###
312-5513###
312-5514###
312-5515###
312-5516###
312-5517###
312-5518###
312-5519###