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: BLTMMDCHPMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
443-961 A Baltimore MD 820C INTRADO COMMUNICATIONS, LLC 238      
443-961 0 Baltimore MD 820C INTRADO COMMUNICATIONS, LLC 238   2015-02-13   
443-961 9 Baltimore MD 820C INTRADO COMMUNICATIONS, LLC 238   2015-02-13   
667-771 0 Baltimore MD 820C INTRADO COMMUNICATIONS, LLC 238   2016-08-20   

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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