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Phone Directory 312-939 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 939-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-939 Chicago, IL Ameritech Illinois Cook Landline 02/04/1994

Other Series For Prefixes

312-9390###
312-9391###
312-9392###
312-9393###
312-9394###
312-9395###
312-9396###
312-9397###
312-9398###
312-9399###