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Phone Directory 312-578 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 578-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-578 Chicago, IL Ameritech Illinois Cook Landline 11/11/2003

Other Series For Prefixes

312-5780###
312-5781###
312-5782###
312-5783###
312-5784###
312-5785###
312-5786###
312-5787###
312-5788###
312-5789###