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Phone Directory 312-856 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 856-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-856 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-8560###
312-8561###
312-8562###
312-8563###
312-8564###
312-8565###
312-8566###
312-8567###
312-8568###
312-8569###