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Phone Directory 312-603 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 603-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-603 Chicago, IL Ameritech Illinois Cook Landline 09/11/1994

Other Series For Prefixes

312-6030###
312-6031###
312-6032###
312-6033###
312-6034###
312-6035###
312-6036###
312-6037###
312-6038###
312-6039###