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Phone Directory 312-380 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 380-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-380 Chicago, IL Ameritech Illinois Cook Landline 08/20/2000

Other Series For Prefixes

312-3800###
312-3801###
312-3802###
312-3803###
312-3804###
312-3805###
312-3806###
312-3807###
312-3808###
312-3809###