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.

Washington Zone 13, MD

<< 1 2 3 4 5

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
301-886 7   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-886 8 HRNDVACKAMD  1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 236      
301-901 A CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-901 0 VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-901 1 CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-901 2 CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-901 3 VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-901 4 CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-901 5 VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-901 6 CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-901 7 VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-901 8 VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-901 9 CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-902 A BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-902 0 VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-902 1 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-902 2 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-902 3 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-902 4 WASHDCINDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-902 5 WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236      
301-902 6 WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236      
301-902 7 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236      
301-902 8 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-902 9 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-923 A WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236      
301-923 0   071F BANDWIDTH.COM CLEC, LLC - MD 236      
301-923 2   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-923 3   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-923 4 VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-923 5 BTVLMD127MD  5562 METROPCS, INC. 236      
301-923 7   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-923 8   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-923 9 VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-931 A BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-931 0 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-931 1 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-931 2 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-931 3 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-931 4 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-931 5 HRNDVACKBMD  5977 BROADVIEW NETWORKS, INC. - DC 236      
301-931 6 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-931 7 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-931 8 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-931 9 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-935 A HYVLMDRIDS0  9212 VERIZON MARYLAND, INC. 236      
301-935 0 HYVLMDRIDS0  9212 VERIZON MARYLAND, INC. 236      
301-935 2   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-935 3   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-935 4 HYVLMDRIDS0  9212 VERIZON MARYLAND, INC. 236      
301-935 5 HYVLMDRIDS0  9212 VERIZON MARYLAND, INC. 236      
301-935 6 HYVLMDRIDS0  9212 VERIZON MARYLAND, INC. 236      
301-935 7   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-935 8   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-935 9   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-937 A BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-939 A LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-939 0 SLSPMD91DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 236      
301-939 1 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-939 2 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-939 3 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-939 4 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-939 5 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-939 6 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-939 7 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-939 8   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-939 9   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-953 A LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-953 0 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-953 1 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-953 2 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-953 3 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-953 4 WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236      
301-953 5 WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236      
301-953 7 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-953 8 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-953 9 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-982 A CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-993 A CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      

<< 1 2 3 4 5

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.