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Phone Directory 312-666 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 666-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-666 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-6660###
312-6661###
312-6662###
312-6663###
312-6664###
312-6665###
312-6666###
312-6667###
312-6668###
312-6669###