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: 876D ONVOY, 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 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 >>

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
443-453 0 Baltimore MD   238   2007-12-03   
443-455 9 Baltimore MD   238   2024-02-24   
443-456 4 Edgewood MD   238   2016-01-21   
443-457 2 Brooklyn Park-Linthicum MD   238   2016-03-24   
443-457 9 Brooklyn Park-Linthicum MD   238   2016-03-24   
443-464 0 Churchville MD   238   2015-10-04   
443-464 1 Churchville MD   238   2016-03-25   
443-464 2 Churchville MD   238   2016-03-25   
443-484 0 Edgewood MD   238   2021-07-11   
443-486 1 Prince Frederick MD   238   2016-03-10   
443-486 3 Prince Frederick MD   238   2016-03-10   
443-486 6 Prince Frederick MD   238   2021-09-23   
443-487 0 Westminster MD   238   2022-10-16   
443-489 2 Chase MD   238   2016-03-24   
443-489 4 Chase MD   238   2016-03-24   
443-491 A Parkton MD   238      
443-491 9 Parkton MD   238   2012-10-07   
443-493 7 Delmar MD   242   2017-04-13   
443-493 8 Delmar MD   242   2021-04-02   
443-494 2 Millersville MD   238   2012-10-07   
443-494 5 Millersville MD   238   2021-04-02   
443-495 6 Parkville MD   238   2018-05-27   
443-496 3 Easton MD   242   2018-07-19   
443-499 5 Jarrettsville MD   238   2023-10-22   
443-499 9 Jarrettsville MD   238   2012-10-07   
443-501 2 Pikesville MD   238   2012-10-08   
443-508 7 Hampstead MD   238   2012-10-07   
443-512 2 Edgewood MD   238   2014-09-05   
443-513 2 Berlin MD   242   2020-08-09   
443-516 A Sykesville MD   238      
443-516 8 Sykesville MD   238   2016-03-28   
443-516 9 Sykesville MD   238   2016-03-28   
443-526 3 Havre de Grace MD   238   2016-03-24   
443-526 4 Havre de Grace MD   238   2016-03-24   
443-526 7 Havre de Grace MD   238   2015-08-01   
443-526 8 Havre de Grace MD   238   2015-08-01   
443-530 5 Dundalk MD   238   2016-01-22   
443-533 5 Jarrettsville MD   238   2016-04-04   
443-533 6 Jarrettsville MD   238   2016-04-04   
443-543 8 Arbutus MD   238   2014-10-06   
443-543 9 Arbutus MD   238   2014-10-06   
443-545 0 Columbia MD   238   2021-09-25   
443-545 7 Columbia MD   238   2016-03-03   
443-550 7 North Beach MD   238   2012-10-07   
443-551 0 Woodlawn MD   238   2024-05-11   
443-551 2 Woodlawn MD   238   2024-07-05   
443-551 6 Woodlawn MD   238   2025-02-01   
443-551 7 Woodlawn MD   238   2025-02-01   
443-551 8 Woodlawn MD   238   2024-10-21   
443-551 9 Woodlawn MD   238   2024-10-21   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 >>

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.