Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 227 [Rate centres in NPA 227] [Dial plan for NPA 227]

Block: A

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NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
227-304 A Washington Zone 10 MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2025-12-15   
227-305 A Washington Zone 10 MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2026-02-20   
227-310 A Washington Zone 10 MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2026-04-25   
227-315 A Ashton MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2026-03-06   
227-333 A Washington Zone 16 MD   876D ONVOY, LLC - MD 236   2025-10-16   
227-334 A Keedysville MD FRDRMDFRX2Y  7421 AT&T - LOCAL 240   2024-12-23   
227-338 A Washington Zone 10 MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2025-12-04   
227-368 A Mechanicsville MD WASHDCSWFMD  530H WIDE VOICE, LLC - MD 236      
227-444 A Washington Zone 2 MD   876D ONVOY, LLC - MD 236   2025-10-16   
227-529 A Gaithersburg MD   876D ONVOY, LLC - MD 236   2026-02-20   
227-666 A Frederick MD   876D ONVOY, LLC - MD 240   2026-02-17   
227-722 A Waldorf MD WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2024-06-26   
227-727 A Washington Zone 6 MD WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2025-01-02   
227-770 A Washington Zone 11 MD WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2025-01-02   
227-772 A Washington Zone 4 MD WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2025-01-02   
227-777 A Ashton (Baltimore LATA) MD BLTMMDCHYMD  530H WIDE VOICE, LLC - MD 238      
227-800 A Frederick MD FRDRMDFRXPX  624H ONVOY SPECTRUM, LLC 240   2025-01-02   
227-888 A Washington Zone 15 (Baltimore LATA) MD BLTMMDCHYMD  530H WIDE VOICE, LLC - MD 238      
227-997 A Washington Zone 2 MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2025-04-11   
227-998 A Washington Zone 2 MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2024-11-22   
227-999 A Washington Zone 10 MD WASHDCSWFMD  530H WIDE VOICE, LLC - MD 236      

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Last updated: Wed, 04 Mar 2026 03:00:52 UTC

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