Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 443 [Rate centres in NPA 443] [Dial plan for NPA 443]

NXX: 644

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-644 A Jarrettsville MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-644 1 Jarrettsville MD   829J PAETEC ITEL, LLC 238      
443-644 2 Jarrettsville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-22   
443-644 3 Jarrettsville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-06-16   
443-644 4 Jarrettsville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-06-16   
443-644 6 Jarrettsville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-22   
443-644 7 Jarrettsville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-22   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

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