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Phone Directory 312-204 Detail

State Major City Time Zone
Illinois Chicago Central

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-204 Chicago, IL Ameritech Illinois Cook Landline 10/11/1997

Other Series For Prefixes

312-2040###
312-2041###
312-2042###
312-2043###
312-2044###
312-2045###
312-2046###
312-2047###
312-2048###
312-2049###