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.

OCN: 6119 LEVEL 3 COMMUNICATIONS, LLC - MD

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 >>

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
301-476 5 Ashton MD MCLNVA23DS4  236   2005-01-20   
301-476 6 Ashton MD MCLNVA23DS4  236   2005-01-20   
301-533 7 Oakland MD FRDRMDFRXMD  240   2008-02-13   
301-547 3 Washington Zone 2 MD MCLNVA23DS4  236   2006-06-04   
301-557 A Washington Zone 3 MD MCLNVA23DS4  236      
301-557 1 Washington Zone 3 MD MCLNVA23DS4  236   2011-10-29   
301-557 2 Washington Zone 3 MD MCLNVA23DS4  236   2011-10-29   
301-557 3 Washington Zone 3 MD MCLNVA23DS4  236   2011-10-29   
301-557 4 Washington Zone 3 MD MCLNVA23DS4  236   2011-10-29   
301-557 5 Washington Zone 3 MD MCLNVA23DS4  236   2011-10-29   
301-557 6 Washington Zone 3 MD MCLNVA23DS4  236   2011-10-29   
301-557 7 Washington Zone 3 MD MCLNVA23DS4  236   2011-10-29   
301-557 8 Washington Zone 3 MD MCLNVA23DS4  236   2011-10-29   
301-563 9 Washington Zone 3 MD MCLNVA23DS4  236   2007-12-04   
301-579 3 Brandywine MD MCLNVA23DS4  236   2005-01-04   
301-579 4 Brandywine MD MCLNVA23DS4  236   2003-03-24   
301-579 5 Brandywine MD MCLNVA23DS4  236   2004-12-13   
301-605 9 Washington Zone 10 MD MCLNVA23DS4  236   2012-01-14   
301-637 A Washington Zone 10 MD MCLNVA23DS4  236      
301-637 0 Washington Zone 10 MD MCLNVA23DS4  236   2004-12-13   
301-637 2 Washington Zone 10 MD MCLNVA23DS4  236   2006-04-07   
301-637 3 Washington Zone 10 MD MCLNVA23DS4  236   2006-04-07   
301-637 4 Washington Zone 10 MD MCLNVA23DS4  236      
301-637 5 Washington Zone 10 MD MCLNVA23DS4  236   2005-04-03   
301-637 6 Washington Zone 10 MD MCLNVA23DS4  236   2005-04-03   
301-637 7 Washington Zone 10 MD MCLNVA23DS4  236   2005-04-03   
301-637 8 Washington Zone 10 MD MCLNVA23DS4  236   2006-06-17   
301-658 1 Ashton MD MCLNVA23DS4  236   2005-01-20   
301-658 2 Ashton MD MCLNVA23DS4  236   2005-01-20   
301-658 3 Ashton MD MCLNVA23DS4  236   2005-01-20   
301-658 5 Ashton MD MCLNVA23DS4  236   2005-01-20   
301-658 6 Ashton MD MCLNVA23DS4  236   2005-01-20   
301-658 7 Ashton MD MCLNVA23DS4  236   2005-01-20   
301-664 2 Washington Zone 2 MD MCLNVA23DS4  236   2019-06-06   
301-684 5 Indian Head MD MCLNVA23DS4  236   2011-03-14   
301-685 1 Damascus MD MCLNVA23DS4  236   2003-03-24   
301-685 5 Damascus MD MCLNVA23DS4  236   2005-01-04   
301-685 6 Damascus MD MCLNVA23DS4  236   2005-01-04   
301-703 A Mount Airy MD FRDRMDFRXMD  240      
301-703 2 Mount Airy MD FRDRMDFRXMD  240   2006-05-20   
301-703 9 Mount Airy MD FRDRMDFRXMD  240   2005-02-17   
301-710 A Waldorf MD MCLNVA23DS4  236      
301-710 0 Waldorf MD MCLNVA23DS4  236   2007-10-17   
301-710 1 Waldorf MD MCLNVA23DS4  236   2007-12-04   
301-710 5 Waldorf MD MCLNVA23DS4  236   2006-02-20   
301-710 6 Waldorf MD MCLNVA23DS4  236   2006-02-20   
301-710 9 Waldorf MD MCLNVA23DS4  236   2007-10-26   
301-715 3 Washington Zone 15 MD MCLNVA23DS4  236   2009-10-09   
301-741 A Laurel MD MCLNVA23DS4  236      
301-741 4 Laurel MD MCLNVA23DS4  236      

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 >>

Last updated: Thu, 05 Feb 2026 23:41:55 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.