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.

Switch: WASHDCSWFMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
202-666 A Washington Zone 1 DC 538H WIDE VOICE, LLC - DC 236      
202-666 6 Washington Zone 1 DC 538H WIDE VOICE, LLC - DC 236   2021-11-13   
202-851 A Washington Zone 1 DC 538H WIDE VOICE, LLC - DC 236      
202-851 1 Washington Zone 1 DC 538H WIDE VOICE, LLC - DC 236   2016-02-04   
202-988 8 Washington Zone 1 DC 538H WIDE VOICE, LLC - DC 236   2024-02-10   
227-222 A Washington Zone 16 MD 530H WIDE VOICE, LLC - MD 236      
227-222 2 Washington Zone 16 MD 530H WIDE VOICE, LLC - MD 236   2023-12-18   
227-368 A Mechanicsville MD 530H WIDE VOICE, LLC - MD 236      
227-368 6 Mechanicsville MD 530H WIDE VOICE, LLC - MD 236   2023-10-21   
227-999 A Washington Zone 10 MD 530H WIDE VOICE, LLC - MD 236      
227-999 9 Washington Zone 10 MD 530H WIDE VOICE, LLC - MD 236   2023-12-15   
771-333 A Washington Zone 1 DC 538H WIDE VOICE, LLC - DC 236      
771-333 3 Washington Zone 1 DC 538H WIDE VOICE, LLC - DC 236   2022-05-23   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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