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: LARLMDCC5MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
202-370 A Washington Zone 1 DC 2801 LEVEL 3 TELECOM OF D.C., LLC - DC 236      
202-372 A Washington Zone 1 DC 2801 LEVEL 3 TELECOM OF D.C., LLC - DC 236      
202-601 A Washington Zone 1 DC 2801 LEVEL 3 TELECOM OF D.C., LLC - DC 236      
202-780 A Washington Zone 1 DC 2801 LEVEL 3 TELECOM OF D.C., LLC - DC 236      
202-854 A Washington Zone 1 DC 2801 LEVEL 3 TELECOM OF D.C., LLC - DC 236      
202-856 A Washington Zone 1 DC 2801 LEVEL 3 TELECOM OF D.C., LLC - DC 236      
202-894 A Washington Zone 1 DC 2801 LEVEL 3 TELECOM OF D.C., LLC - DC 236      
240-612 A Washington Zone 5 MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
240-857 A Washington Zone 5 MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
240-863 A Washington Zone 3 MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-323 A Laurel MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-361 A Washington Zone 4 MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-389 A Washington Zone 13 MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-756 A Washington Zone 14 MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-981 A Washington Zone 5 MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
410-824 A Waterloo (Washington DC LATA) MD 7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
703-265 A Washington Zone 19 VA 7769 LEVEL 3 TELECOM OF VIRGINIA, LLC - VA 236      
703-386 A Washington Zone 19 VA 7769 LEVEL 3 TELECOM OF VIRGINIA, LLC - VA 236      
703-639 A Washington Zone 17 VA 7769 LEVEL 3 TELECOM OF VIRGINIA, LLC - VA 236      
703-650 A Washington Zone 8 VA 7769 LEVEL 3 TELECOM OF VIRGINIA, LLC - VA 236      
703-677 A Washington Zone 17 VA 7769 LEVEL 3 TELECOM OF VIRGINIA, LLC - VA 236      
703-678 A Washington Zone 8 VA 7769 LEVEL 3 TELECOM OF VIRGINIA, LLC - VA 236      
703-983 A Washington Zone 17 VA 7769 LEVEL 3 TELECOM OF VIRGINIA, LLC - VA 236      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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