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: WASHDCSWX2Z

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
202-378 A Washington Zone 1 DC 7421 AT&T LOCAL 236      
301-820 A Gaithersburg MD 7421 AT&T LOCAL 236      
301-821 A Laurel MD 7421 AT&T LOCAL 236      
301-822 A Washington Zone 11 MD 7421 AT&T LOCAL 236      
301-823 A Washington Zone 13 MD 7421 AT&T LOCAL 236      
301-825 A Washington Zone 10 MD 7421 AT&T LOCAL 236      
301-828 A Washington Zone 2 MD 7421 AT&T LOCAL 236      
301-830 A Washington Zone 3 MD 7421 AT&T LOCAL 236      
301-832 A Washington Zone 4 MD 7421 AT&T LOCAL 236      

Last updated: Sun, 04 Apr 2021 19:28:27 UTC

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