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Phone Directory 312-604 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 604-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-604 Chicago, IL Xo Illinois Cook Landline 01/25/1998

Other Series For Prefixes

312-6040###
312-6041###
312-6042###
312-6043###
312-6044###
312-6045###
312-6046###
312-6047###
312-6048###
312-6049###