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 14, MD

<< 1 2 3 4 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
301-291 9 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-352 A BOWIMDBODS0  9212 VERIZON MARYLAND, INC. 236      
301-383 A ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236      
301-383 0 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236      
301-383 1 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236      
301-383 2 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236      
301-383 3 BTVLMD127MD  5562 METROPCS, INC. 236      
301-383 4 BTVLMD127MD  5562 METROPCS, INC. 236      
301-383 5 BTVLMD127MD  5562 METROPCS, INC. 236      
301-383 6 BTVLMD127MD  5562 METROPCS, INC. 236      
301-383 7 BTVLMD127MD  5562 METROPCS, INC. 236      
301-383 8 SLSPMD91DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 236      
301-383 9 SLSPMD91DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 236      
301-390 A UPMRMDCCDS0  9212 VERIZON MARYLAND, INC. 236      
301-390 0 UPMRMDCCDS0  9212 VERIZON MARYLAND, INC. 236      
301-390 1 UPMRMDCCDS0  9212 VERIZON MARYLAND, INC. 236      
301-390 2 UPMRMDCCDS0  9212 VERIZON MARYLAND, INC. 236      
301-390 3 UPMRMDCCDS0  9212 VERIZON MARYLAND, INC. 236      
301-390 4 UPMRMDCCDS0  9212 VERIZON MARYLAND, INC. 236      
301-390 5 UPMRMDCCDS0  9212 VERIZON MARYLAND, INC. 236      
301-390 6 BOWIMDBODS0  9212 VERIZON MARYLAND, INC. 236      
301-390 7 UPMRMDCCDS0  9212 VERIZON MARYLAND, INC. 236      
301-390 8 UPMRMDCCDS0  9212 VERIZON MARYLAND, INC. 236      
301-390 9 UPMRMDCCDS0  9212 VERIZON MARYLAND, INC. 236      
301-430 A UPMRMDCCDS0  9212 VERIZON MARYLAND, INC. 236      
301-430 0 UPMRMDCCDS0  9212 VERIZON MARYLAND, INC. 236      
301-430 1   515J IP HORIZON LLC 236      
301-430 2 UPMRMDCCDS0  9212 VERIZON MARYLAND, INC. 236      
301-430 3   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-430 4   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-430 5 UPMRMDCCDS0  9212 VERIZON MARYLAND, INC. 236      
301-430 6 UPMRMDCCDS0  9212 VERIZON MARYLAND, INC. 236      
301-430 7 UPMRMDCCDS0  9212 VERIZON MARYLAND, INC. 236      
301-430 8 UPMRMDCCDS0  9212 VERIZON MARYLAND, INC. 236      
301-430 9   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-464 A BOWIMDBODS0  9212 VERIZON MARYLAND, INC. 236      
301-470 A LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-470 0   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-470 1 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-470 2 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-470 3 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-470 4 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-470 5 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-470 6 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-470 7 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-470 8 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-470 9 LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      
301-666 A WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-666 0   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-666 1   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-666 2 VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-666 3 WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-666 4   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-666 5   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-666 6   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-666 7 WASIDCRG7MD  508J CENTURYLINK COMMUNICATIONS, LLC 236      
301-666 8   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-666 9   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-677 A WASHDCDTDS1  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-756 A LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-756 0 LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-756 1 WASHDC127MD  073H TELNYX LLC 236      
301-756 2   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-756 3 LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-756 4 LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-756 5 VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-756 6 BTVLMD127MD  5562 METROPCS, INC. 236      
301-756 7 LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-756 8 LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-756 9 LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-794 A LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-794 0 LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-794 1 LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-794 2   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-794 3 LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-794 4 LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-794 5 LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-794 6 LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-794 7 LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-794 8 LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-794 9 LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-805 A BOWIMDBODS0  9212 VERIZON MARYLAND, INC. 236      
301-809 A BOWIMDBODS0  9212 VERIZON MARYLAND, INC. 236      
301-809 0 BOWIMDBODS0  9212 VERIZON MARYLAND, INC. 236      
301-809 1 BOWIMDBODS0  9212 VERIZON MARYLAND, INC. 236      
301-809 2 BOWIMDBODS0  9212 VERIZON MARYLAND, INC. 236      
301-809 3 BOWIMDBODS0  9212 VERIZON MARYLAND, INC. 236      
301-809 4 BOWIMDBODS0  9212 VERIZON MARYLAND, INC. 236      
301-809 5 BOWIMDBODS0  9212 VERIZON MARYLAND, INC. 236      
301-809 6 BOWIMDBODS0  9212 VERIZON MARYLAND, INC. 236      
301-809 7 BTVLMD127MD  5562 METROPCS, INC. 236      
301-809 8 BOWIMDBODS0  9212 VERIZON MARYLAND, INC. 236      
301-809 9 BOWIMDBODS0  9212 VERIZON MARYLAND, INC. 236      
301-833 A WASHDCDTDS1  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-833 0   2593 CORE COMMUNICATIONS, INC.- MD 236      
301-833 1 WASHDCDTDS1  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-833 2 WASHDCDTDS1  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-833 3 WASHDCDTDS1  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-833 4 WASHDCDTDS1  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-833 5 WASHDCDTDS1  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      

<< 1 2 3 4 >>

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.