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Phone Directory 312-864 Detail

State Major City Time Zone
Illinois Chicago Central

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Example: (312) 864-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-864 Chicago, IL Ameritech Illinois Cook Landline 10/31/2000

Other Series For Prefixes

312-8640###
312-8641###
312-8642###
312-8643###
312-8644###
312-8645###
312-8646###
312-8647###
312-8648###
312-8649###