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Phone Directory 312-377 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 377-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-377 Chicago, IL Xo Illinois Cook Landline 01/25/1998

Other Series For Prefixes

312-3770###
312-3771###
312-3772###
312-3773###
312-3774###
312-3775###
312-3776###
312-3777###
312-3778###
312-3779###