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Phone Directory 312-256 Detail

State Major City Time Zone
Illinois Chicago Central

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-256 Chicago, IL Allegiance Telecom Cook Landline 01/25/1998

Other Series For Prefixes

312-2560###
312-2561###
312-2562###
312-2563###
312-2564###
312-2565###
312-2566###
312-2567###
312-2568###
312-2569###