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.
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OCN: 4773 XO MARYLAND, LLC

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
240-206 A Washington Zone 14 MD WASHDCCZDS0  236      
240-206 0 Washington Zone 14 MD   236      
240-206 2 Washington Zone 14 MD   236      
240-206 3 Washington Zone 14 MD   236   2005-08-15   
240-206 4 Washington Zone 14 MD   236   2005-08-15   
240-241 5 Washington Zone 13 MD   236   2007-07-09   
240-241 6 Washington Zone 13 MD   236   2007-07-09   
240-254 0 Hughesville MD   236   2005-08-15   
240-254 3 Hughesville MD   236   2005-08-15   
240-254 5 Hughesville MD   236   2005-08-15   
240-254 6 Hughesville MD   236   2005-08-15   
240-256 7 Leonardtown MD   236   2005-08-15   
240-256 8 Leonardtown MD   236   2005-08-15   
240-257 7 Nanjemoy MD   236   2010-11-19   
240-264 5 Laurel MD   236   2006-10-27   
240-280 0 Laurel MD   236   2004-09-15   
240-292 7 Washington Zone 11 MD   236   2007-07-29   
240-294 A Laurel MD WASHDCCZDS0  236      
240-294 0 Laurel MD   236      
240-294 9 Laurel MD   236      
240-316 3 Washington Zone 2 MD   236   2009-07-31   
240-317 6 Lexington Park-Great Mills MD   236   2007-02-19   
240-319 7 Laurel (Baltimore LATA) MD   238   2010-08-22   
240-349 3 La Plata MD   236   2005-08-15   
240-383 1 Washington Zone 2 MD   236   2007-07-22   
240-383 3 Washington Zone 2 MD   236   2007-07-22   
240-387 6 Washington Zone 13 MD   236   2007-02-22   
240-387 7 Washington Zone 13 MD   236   2007-02-22   
240-390 2 Ashton MD   236   2006-08-12   
240-399 A Washington Zone 10 MD WASHDCCZDS0  236      
240-404 A Gaithersburg MD WASHDCCZDS0  236      
240-404 0 Gaithersburg MD   236      
240-404 6 Gaithersburg MD   236   2005-08-15   
240-404 7 Gaithersburg MD   236   2005-08-15   
240-404 9 Gaithersburg MD   236      
240-408 7 Washington Zone 10 MD   236   2011-03-15   
240-408 8 Washington Zone 10 MD   236   2011-03-15   
240-427 A Waldorf MD WASHDCCZDS0  236      
240-427 0 Waldorf MD   236      
240-427 3 Waldorf MD   236   2005-05-11   
240-427 4 Waldorf MD   236   2005-05-11   
240-427 9 Waldorf MD   236      
240-437 A Ashton MD WASHDCCZDS0  236      
240-437 0 Ashton MD   236      
240-437 5 Ashton MD   236      
240-454 8 Gaithersburg MD   236   2006-08-12   
240-454 9 Gaithersburg MD   236   2006-08-12   
240-459 6 Laurel MD   236   2011-04-01   
240-489 A Poolesville MD WASHDCCZDS0  236      
240-489 0 Poolesville MD   236      

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Last updated: Sat, 27 Jul 2019 10:59:49 UTC

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