Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
443-585 8 Darlington MD 876D ONVOY, LLC - MD 238   2014-09-19   
443-585 9 Darlington MD 876D ONVOY, LLC - MD 238   2014-09-19   
443-586 0 Dundalk MD 876D ONVOY, LLC - MD 238   2024-02-29   
443-586 1 Dundalk MD 876D ONVOY, LLC - MD 238   2024-02-29   
443-586 7 Dundalk MD 876D ONVOY, LLC - MD 238   2024-02-29   
443-586 8 Dundalk MD 876D ONVOY, LLC - MD 238   2024-07-27   
443-586 9 Dundalk MD 876D ONVOY, LLC - MD 238   2024-09-15   
443-589 6 Cockeysville MD 876D ONVOY, LLC - MD 238   2024-07-15   
443-589 7 Cockeysville MD 876D ONVOY, LLC - MD 238   2016-03-14   
443-589 8 Cockeysville MD 876D ONVOY, LLC - MD 238   2016-03-14   
443-590 0 Reisterstown MD 876D ONVOY, LLC - MD 238   2024-12-14   
443-590 1 Reisterstown MD 876D ONVOY, LLC - MD 238   2025-06-13   
443-590 7 Reisterstown MD 876D ONVOY, LLC - MD 238   2016-03-21   
443-590 9 Reisterstown MD 876D ONVOY, LLC - MD 238   2016-03-21   
443-594 6 Sparrows Point MD 876D ONVOY, LLC - MD 238   2012-10-08   
443-594 7 Sparrows Point MD 876D ONVOY, LLC - MD 238   2016-03-24   
443-594 8 Sparrows Point MD 876D ONVOY, LLC - MD 238   2016-03-24   
443-595 9 Sparks-Glencoe MD 876D ONVOY, LLC - MD 238   2012-10-08   
443-596 0 Essex MD 876D ONVOY, LLC - MD 238   2024-02-25   
443-596 6 Essex MD 876D ONVOY, LLC - MD 238   2018-05-27   
443-596 9 Essex MD 876D ONVOY, LLC - MD 238   2024-02-25   
443-597 4 Severna Park MD 876D ONVOY, LLC - MD 238   2025-05-10   
443-598 5 Sherwood Forest MD 876D ONVOY, LLC - MD 238   2020-10-17   
443-601 3 Fallston MD 876D ONVOY, LLC - MD 238   2016-03-23   
443-601 4 Fallston MD 876D ONVOY, LLC - MD 238   2016-03-23   
443-606 6 Fork MD 876D ONVOY, LLC - MD 238   2015-11-27   
443-620 1 Waterloo MD 876D ONVOY, LLC - MD 238   2021-04-29   
443-625 0 Fork MD 876D ONVOY, LLC - MD 238   2025-05-03   
443-625 2 Fork MD 876D ONVOY, LLC - MD 238   2015-06-13   
443-625 4 Fork MD 876D ONVOY, LLC - MD 238   2015-06-13   
443-627 9 Baltimore MD 876D ONVOY, LLC - MD 238   2010-10-20   
443-637 6 Armiger-Gibson Island MD 876D ONVOY, LLC - MD 238   2012-10-07   
443-639 1 Hampstead MD 876D ONVOY, LLC - MD 238   2024-05-23   
443-639 8 Hampstead MD 876D ONVOY, LLC - MD 238   2014-10-21   
443-639 9 Hampstead MD 876D ONVOY, LLC - MD 238   2014-10-21   
443-645 4 Millersville MD 876D ONVOY, LLC - MD 238   2016-03-24   
443-645 5 Millersville MD 876D ONVOY, LLC - MD 238   2016-03-24   
443-645 6 Millersville MD 876D ONVOY, LLC - MD 238   2016-10-20   
443-646 4 North Beach MD 876D ONVOY, LLC - MD 238   2016-03-23   
443-646 8 North Beach MD 876D ONVOY, LLC - MD 238   2016-03-23   
443-647 3 New Windsor MD 876D ONVOY, LLC - MD 238   2016-04-08   
443-647 4 New Windsor MD 876D ONVOY, LLC - MD 238   2016-04-08   
443-647 8 New Windsor MD 876D ONVOY, LLC - MD 238   2016-03-17   
443-647 9 New Windsor MD 876D ONVOY, LLC - MD 238   2016-03-17   
443-648 9 Essex MD 876D ONVOY, LLC - MD 238   2012-10-07   
443-652 1 Towson MD 876D ONVOY, LLC - MD 238   2024-11-04   
443-656 9 Columbia MD 876D ONVOY, LLC - MD 238   2021-07-11   
443-657 8 Randallstown MD 876D ONVOY, LLC - MD 238   2024-02-29   
443-657 9 Randallstown MD 876D ONVOY, LLC - MD 238   2024-02-29   
443-658 A Woodlawn MD 876D ONVOY, LLC - MD 238      

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Last updated: Tue, 01 Sep 2026 00:40:05 UTC

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