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Phone Directory 312-634 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 634-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-634 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-6340###
312-6341###
312-6342###
312-6343###
312-6344###
312-6345###
312-6346###
312-6347###
312-6348###
312-6349###