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Phone Directory 312-780 Detail

State Major City Time Zone
Illinois Chicago Central

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
312-780 Chicago, IL Mci Worldcom Communications Cook Landline 01/11/1997

Other Series For Prefixes

312-7800###
312-7801###
312-7802###
312-7803###
312-7804###
312-7805###
312-7806###
312-7807###
312-7808###
312-7809###