Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 227 [Rate centres in NPA 227] [Dial plan for NPA 227]

Block: A

<< 1 2 3

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
227-301 A Washington Zone 2 MD CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2026-05-02   
227-302 A Washington Zone 4 MD WASHDC12NMD  490J BOOST SUBSCRIBERCO L.L.C. 236   2026-06-04   
227-303 A Washington Zone 10 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2025-12-18   
227-304 A Washington Zone 10 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2025-12-15   
227-305 A Washington Zone 10 MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
227-306 A Leonardtown MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2026-08-10   
227-307 A Washington Zone 2 MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2026-09-06   
227-308 A Washington Zone 3 MD   876D ONVOY, LLC - MD 236   2026-09-17   
227-309 A Washington Zone 13 MD   876D ONVOY, LLC - MD 236   2026-09-17   
227-310 A Washington Zone 10 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2026-04-25   
227-315 A Ashton MD   071F BANDWIDTH.COM CLEC, LLC - MD 236      
227-333 A Washington Zone 16 MD VINNVACBDS0  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 BTVLMD12CMA  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 VINNVACBDS0  876D ONVOY, LLC - MD 236   2025-10-16   
227-500 A Gaithersburg MD WASHDC12X6X  824J OPENTACT INC. 236   2026-05-09   
227-529 A Gaithersburg MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2026-02-20   
227-666 A Frederick MD CMLDMDCMEMD  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 WASKDCFNAMD  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      

<< 1 2 3

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.