Local Calling Guide

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

NXX: 639

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
978-639 A Sudbury MA   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 128      
978-639 0 Sudbury MA   145J TERRA NOVA TELECOM INC. 128   2024-09-09   
978-639 3 Sudbury MA   829J PAETEC ITEL, LLC 128   2006-10-02   
978-639 4 Sudbury MA   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 128   2008-09-30   
978-639 6 Sudbury MA   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 128      
978-639 7 Sudbury MA   508J CENTURYLINK COMMUNICATIONS, LLC 128   2014-04-24   
978-639 8 Sudbury MA   268F PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 128   2013-05-05   
978-639 9 Sudbury MA   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 128      

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

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