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: CHCHMDBEX4X

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
240-497 7 Washington Zone 2 MD 551G NUSO, LLC 236   2018-07-23   
240-534 4 Washington Zone 2 MD 551G NUSO, LLC 236   2016-08-31   
240-534 5 Washington Zone 2 MD 551G NUSO, LLC 236   2016-08-31   
240-534 6 Washington Zone 2 MD 551G NUSO, LLC 236   2016-08-31   
240-534 7 Washington Zone 2 MD 551G NUSO, LLC 236   2016-08-31   
240-802 A Washington Zone 2 MD 551G NUSO, LLC 236      
240-802 1 Washington Zone 2 MD 551G NUSO, LLC 236   2013-07-12   
301-215 2 Washington Zone 2 MD 551G NUSO, LLC 236   2018-10-14   
301-215 3 Washington Zone 2 MD 551G NUSO, LLC 236   2018-10-14   
301-547 6 Washington Zone 2 MD 551G NUSO, LLC 236   2016-08-31   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

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