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Phone Directory 312-855 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 855-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-855 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-8550###
312-8551###
312-8552###
312-8553###
312-8554###
312-8555###
312-8556###
312-8557###
312-8558###
312-8559###