Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 978 [Rate centres in NPA 978] [Dial plan for NPA 978]

NXX: 666

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
978-666 A Salem MA CMBRMAORDSG  4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128      
978-666 0 Salem MA   4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2004-12-11   
978-666 1 Salem MA   145J TERRA NOVA TELECOM INC. 128   2025-04-08   
978-666 4 Salem MA   4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128      
978-666 6 Salem MA   892D ONVOY, LLC - MA 128   2014-09-15   
978-666 8 Salem MA   145J TERRA NOVA TELECOM INC. 128   2025-11-24   
978-666 9 Salem MA   624H ONVOY SPECTRUM, LLC 128   2021-11-27   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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