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
202-620 A Washington Zone 1 DC WASHDCMT8MD  236      
302-350 A Dover DE GRTWDEBSCM8  228      
302-441 A Milford DE GRTWDEBSCM8  228      
302-523 A Wilmington DE GRTWDEBSCM8  228      
302-822 A Georgetown DE GRTWDEBSCM8  228      
410-270 A Salisbury MD SLBRMD90CM8  242      
410-380 A Salisbury MD SLBRMD90CM8  242      
410-930 A Waterloo (Washington DC LATA) MD LARLMD90CM0  236      
610-512 A Allentown (Lehigh) PA GRTWDEBSCM8  228      
757-830 A Newport News Zone 1 VA VRBIVANZ0MD  252      

Last updated: Fri, 01 Jul 2022 02:53:40 UTC

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