Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 447 [Rate centres in NPA 447] [Dial plan for NPA 447]

NXX: 677

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
447-677 A Potomac IL CHMPILCPOMD  224C ONVOY, LLC 370      
447-677 0 Potomac IL CHMPILCPX5Y  624H ONVOY SPECTRUM, LLC 370   2024-05-17   
447-677 6 Potomac IL CHMPILCPOMD  224C ONVOY, LLC 370   2021-06-17   
447-677 7 Potomac IL   145J TERRA NOVA TELECOM INC. 370   2025-05-27   

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

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