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.
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Switch: BLTMMDCHYMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
227-777 A Ashton (Baltimore LATA) MD 530H WIDE VOICE, LLC - MD 238      
227-777 7 Ashton (Baltimore LATA) MD 530H WIDE VOICE, LLC - MD 238   2023-09-30   
227-888 A Washington Zone 15 (Baltimore LATA) MD 530H WIDE VOICE, LLC - MD 238      
227-888 8 Washington Zone 15 (Baltimore LATA) MD 530H WIDE VOICE, LLC - MD 238   2023-11-20   
240-570 9 Ashton (Baltimore LATA) MD 530H WIDE VOICE, LLC - MD 238   2016-05-14   
301-205 9 Washington Zone 14 (Baltimore LATA) MD 530H WIDE VOICE, LLC - MD 238   2016-05-14   
410-587 9 Arbutus MD 530H WIDE VOICE, LLC - MD 238   2016-05-14   
443-464 6 Churchville MD 530H WIDE VOICE, LLC - MD 238   2016-05-14   
443-755 3 Waterloo MD 530H WIDE VOICE, LLC - MD 238   2016-05-14   
667-771 A Baltimore MD 530H WIDE VOICE, LLC - MD 238      
667-771 1 Baltimore MD 530H WIDE VOICE, LLC - MD 238   2016-02-04   

Last updated: Fri, 25 Jul 2025 03:21:23 UTC

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