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: 610

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
301-610 A Washington Zone 10 MD RKVLMDRVDS1  9212 VERIZON MARYLAND, INC. 236      
301-610 0 Washington Zone 10 MD   9212 VERIZON MARYLAND, INC. 236      
301-610 1 Washington Zone 10 MD   9212 VERIZON MARYLAND, INC. 236      
301-610 2 Washington Zone 10 MD   9212 VERIZON MARYLAND, INC. 236      
301-610 3 Washington Zone 10 MD   876D ONVOY, LLC - MD 236   2020-04-30   
301-610 4 Washington Zone 10 MD   9212 VERIZON MARYLAND, INC. 236      
301-610 5 Washington Zone 10 MD   9212 VERIZON MARYLAND, INC. 236      
301-610 6 Washington Zone 10 MD   9212 VERIZON MARYLAND, INC. 236      
301-610 7 Washington Zone 10 MD   9212 VERIZON MARYLAND, INC. 236      
301-610 8 Washington Zone 10 MD   9212 VERIZON MARYLAND, INC. 236      
301-610 9 Washington Zone 10 MD   9212 VERIZON MARYLAND, INC. 236      

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.