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-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
203-404 A New Haven CT HRFRCTBE1MD  920      
203-548 A Stamford CT HRFRCTBE1MD  920      
203-604 A Norwalk CT HRFRCTBE1MD  920      
203-704 A Wolcott CT HRFRCTBE1MD  920      
860-419 A Cornwall CT HRFRCTBE1MD  920      
860-419 8 Cornwall CT HRFRCTBE1MD  920   2006-04-07   

Last updated: Wed, 01 Dec 2021 01:40:16 UTC

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