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Phone Directory 312-729 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 729-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-729 Chicago, IL Ameritech Illinois Cook Landline 07/06/1997

Other Series For Prefixes

312-7290###
312-7291###
312-7292###
312-7293###
312-7294###
312-7295###
312-7296###
312-7297###
312-7298###
312-7299###