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Phone Directory 312-644 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 644-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-644 Chicago, IL Ameritech Illinois Cook Landline 10/11/1997

Other Series For Prefixes

312-6440###
312-6441###
312-6442###
312-6443###
312-6444###
312-6445###
312-6446###
312-6447###
312-6448###
312-6449###