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Phone Directory 312-521 Detail

State Major City Time Zone
Illinois Chicago Central

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-521 Chicago, IL AT&T Local Cook Landline 01/25/1998

Other Series For Prefixes

312-5210###
312-5211###
312-5212###
312-5213###
312-5214###
312-5215###
312-5216###
312-5217###
312-5218###
312-5219###