Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
240-716 1 Washington Zone 5 MD   236   2014-10-10   
240-716 2 Washington Zone 5 MD   236   2014-12-13   
240-716 4 Washington Zone 5 MD   236   2014-12-13   
240-716 8 Washington Zone 5 MD   236   2014-01-13   
240-716 9 Washington Zone 5 MD   236   2014-01-13   
240-719 8 Washington Zone 5 MD   236   2016-12-09   
240-720 1 Gaithersburg MD   236   2025-05-31   
240-720 4 Gaithersburg MD   236   2025-05-31   
240-722 A Ashton MD   236      
240-722 2 Ashton MD   236   2015-06-19   
240-722 3 Ashton MD   236   2025-05-12   
240-722 4 Ashton MD   236   2025-05-12   
240-722 5 Ashton MD   236   2021-03-06   
240-722 7 Ashton MD   236   2013-10-11   
240-722 8 Ashton MD   236   2013-10-11   
240-722 9 Ashton MD   236   2015-06-19   
240-723 1 Washington Zone 3 MD   236   2005-01-08   
240-723 3 Washington Zone 3 MD   236   2005-03-28   
240-723 4 Washington Zone 3 MD   236   2005-03-28   
240-725 2 Lexington Park-Great Mills MD   236   2019-09-13   
240-725 4 Lexington Park-Great Mills MD   236   2018-09-20   
240-725 8 Lexington Park-Great Mills MD   236   2018-12-07   
240-726 0 Washington Zone 4 MD   236   2021-07-08   
240-726 2 Washington Zone 4 MD   236   2021-07-08   
240-726 3 Washington Zone 4 MD   236   2021-07-08   
240-726 8 Washington Zone 4 MD   236   2021-05-30   
240-726 9 Washington Zone 4 MD   236   2021-05-30   
240-728 1 Washington Zone 10 MD   236   2021-01-01   
240-728 3 Washington Zone 10 MD   236   2021-01-01   
240-728 4 Washington Zone 10 MD   236   2021-01-01   
240-728 6 Washington Zone 10 MD   236   2021-01-01   
240-728 8 Washington Zone 10 MD   236   2020-09-08   
240-728 9 Washington Zone 10 MD   236   2020-09-08   
240-729 A Ashton MD BTVLMD12CMA  236      
240-729 0 Ashton MD   236   2020-08-23   
240-729 1 Ashton MD   236   2020-08-23   
240-729 2 Ashton MD   236   2021-03-06   
240-729 3 Ashton MD   236   2020-10-25   
240-729 4 Ashton MD   236   2020-10-25   
240-729 5 Ashton MD   236   2020-10-25   
240-729 6 Ashton MD   236   2021-03-06   
240-729 7 Ashton MD   236   2021-03-06   
240-729 8 Ashton MD   236   2020-07-31   
240-729 9 Ashton MD   236   2020-07-31   
240-733 0 Ashton MD   236   2021-01-01   
240-733 1 Ashton MD   236   2021-01-01   
240-733 2 Ashton MD   236   2021-01-01   
240-733 4 Ashton MD   236   2022-12-11   
240-733 5 Ashton MD   236   2021-07-08   
240-733 6 Ashton MD   236   2021-07-08   
240-733 7 Ashton MD   236   2021-07-08   
240-733 8 Ashton MD   236   2021-01-01   
240-733 9 Ashton MD   236   2021-01-01   
240-739 8 Frederick MD   240   2021-08-20   
240-739 9 Frederick MD   240   2021-08-20   
240-741 9 Frederick MD   240   2021-04-08   
240-743 0 Washington Zone 2 MD   236   2015-08-09   
240-743 6 Washington Zone 2 MD   236   2007-10-09   
240-744 2 Washington Zone 2 MD   236   2005-07-02   
240-744 6 Washington Zone 2 MD   236   2005-11-21   
240-746 5 Brandywine MD   236   2021-09-16   
240-748 8 Washington Zone 3 MD   236   2021-09-23   
240-752 2 Washington Zone 2 MD   236   2005-02-20   
240-752 3 Washington Zone 2 MD   236   2005-03-12   
240-752 4 Washington Zone 2 MD   236   2005-03-12   
240-752 5 Washington Zone 2 MD   236   2005-08-14   
240-755 1 Laurel (Baltimore LATA) MD   238   2007-08-03   
240-755 2 Laurel (Baltimore LATA) MD   238   2007-11-04   
240-755 3 Laurel (Baltimore LATA) MD   238   2008-01-12   
240-755 4 Laurel (Baltimore LATA) MD   238   2008-04-13   
240-755 5 Laurel (Baltimore LATA) MD   238   2008-04-21   
240-755 6 Laurel (Baltimore LATA) MD   238   2008-06-16   
240-756 A Washington Zone 10 MD BTVLMD12CMA  236      
240-756 0 Washington Zone 10 MD   236   2021-07-08   
240-756 1 Washington Zone 10 MD   236   2021-07-08   
240-756 2 Washington Zone 10 MD   236   2021-07-08   
240-756 3 Washington Zone 10 MD   236   2021-07-08   
240-756 4 Washington Zone 10 MD   236   2021-04-10   
240-756 5 Washington Zone 10 MD   236   2021-04-10   
240-756 6 Washington Zone 10 MD   236   2021-04-10   
240-756 7 Washington Zone 10 MD   236   2021-04-10   
240-756 8 Washington Zone 10 MD   236   2021-04-10   
240-756 9 Washington Zone 10 MD   236   2021-04-10   
240-757 0 Washington Zone 13 MD   236   2022-10-14   
240-758 1 Laurel MD   236   2016-07-14   
240-758 2 Laurel MD   236   2016-07-14   
240-760 8 Washington Zone 2 MD   236   2016-02-06   
240-760 9 Washington Zone 2 MD   236   2016-02-06   
240-761 0 Laurel MD   236   2021-10-10   
240-762 9 Washington Zone 2 MD   236   2014-03-23   
240-764 9 Washington Zone 4 MD   236   2013-05-20   
240-765 4 Washington Zone 5 MD   236   2007-11-11   
240-766 6 Washington Zone 6 MD   236   2013-12-27   
240-766 9 Washington Zone 6 MD   236   2013-12-27   
240-772 4 Frederick MD   240   2012-10-18   
240-778 7 Washington Zone 10 MD   236   2008-07-17   
240-779 1 Ashton MD   236   2011-10-27   
240-779 3 Ashton MD   236   2011-10-27   
240-779 4 Ashton MD   236   2011-10-27   
240-779 5 Ashton MD   236   2013-07-22   

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Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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