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Phone Directory 312-275 Detail

State Major City Time Zone
Illinois Chicago Central

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-275 Chicago, IL Allegiance Telecom Cook Landline 01/25/1998

Other Series For Prefixes

312-2750###
312-2751###
312-2752###
312-2753###
312-2754###
312-2755###
312-2756###
312-2757###
312-2758###
312-2759###