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: 301 [Rate centres in NPA 301] [Dial plan for NPA 301]

NXX:

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
301-438 A Washington Zone 12 MD SLSPMDNBDS0  9212 VERIZON MARYLAND, INC. 236      
301-438 0 Washington Zone 12 MD   9212 VERIZON MARYLAND, INC. 236      
301-438 1 Washington Zone 12 MD   9212 VERIZON MARYLAND, INC. 236      
301-438 2 Washington Zone 12 MD   9212 VERIZON MARYLAND, INC. 236      
301-438 3 Washington Zone 12 MD   9212 VERIZON MARYLAND, INC. 236      
301-438 4 Washington Zone 12 MD   7575 CENTURYLINK COMMUNICATIONS LLC 236   2014-06-25   
301-438 5 Washington Zone 12 MD   9212 VERIZON MARYLAND, INC. 236      
301-438 6 Washington Zone 12 MD   9212 VERIZON MARYLAND, INC. 236      
301-438 7 Washington Zone 12 MD   9212 VERIZON MARYLAND, INC. 236      
301-438 8 Washington Zone 12 MD   9212 VERIZON MARYLAND, INC. 236      
301-438 9 Washington Zone 12 MD   9212 VERIZON MARYLAND, INC. 236      

Last updated: Thu, 10 Sep 2020 02:15:24 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.