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
301-301 6 Gaithersburg MD 876D ONVOY, LLC - MD 236   2022-10-23   
301-301 7 Gaithersburg MD 876D ONVOY, LLC - MD 236   2022-10-23   
301-301 8 Gaithersburg MD 876D ONVOY, LLC - MD 236   2022-10-23   
301-301 9 Gaithersburg MD 876D ONVOY, LLC - MD 236   2022-10-23   
301-313 5 Washington Zone 13 MD 876D ONVOY, LLC - MD 236   2021-02-18   
301-321 A Washington Zone 11 MD 876D ONVOY, LLC - MD 236      
301-321 7 Washington Zone 11 MD 876D ONVOY, LLC - MD 236   2016-01-07   
301-321 8 Washington Zone 11 MD 876D ONVOY, LLC - MD 236   2016-01-07   
301-349 3 Poolesville MD 876D ONVOY, LLC - MD 236   2016-03-01   
301-355 3 Gaithersburg MD 876D ONVOY, LLC - MD 236   2008-10-05   
301-357 8 Washington Zone 3 MD 876D ONVOY, LLC - MD 236   2007-09-13   
301-364 0 Washington Zone 4 MD 876D ONVOY, LLC - MD 236   2012-06-20   
301-364 3 Washington Zone 4 MD 876D ONVOY, LLC - MD 236   2008-10-05   
301-373 1 Leonardtown MD 876D ONVOY, LLC - MD 236   2008-10-05   
301-381 A Washington Zone 2 MD 876D ONVOY, LLC - MD 236      
301-381 0 Washington Zone 2 MD 876D ONVOY, LLC - MD 236   2022-09-16   
301-381 1 Washington Zone 2 MD 876D ONVOY, LLC - MD 236   2022-09-16   
301-381 2 Washington Zone 2 MD 876D ONVOY, LLC - MD 236   2022-09-16   
301-381 3 Washington Zone 2 MD 876D ONVOY, LLC - MD 236   2022-09-16   
301-381 4 Washington Zone 2 MD 876D ONVOY, LLC - MD 236   2022-09-16   
301-381 5 Washington Zone 2 MD 876D ONVOY, LLC - MD 236   2022-09-16   
301-381 6 Washington Zone 2 MD 876D ONVOY, LLC - MD 236   2022-09-16   
301-381 7 Washington Zone 2 MD 876D ONVOY, LLC - MD 236   2022-09-16   
301-381 8 Washington Zone 2 MD 876D ONVOY, LLC - MD 236   2022-09-16   
301-381 9 Washington Zone 2 MD 876D ONVOY, LLC - MD 236   2022-09-16   
301-389 2 Washington Zone 13 MD 876D ONVOY, LLC - MD 236   2022-08-21   
301-389 5 Washington Zone 13 MD 876D ONVOY, LLC - MD 236   2016-04-06   
301-389 6 Washington Zone 13 MD 876D ONVOY, LLC - MD 236   2016-04-06   
301-396 7 Waldorf MD 876D ONVOY, LLC - MD 236   2019-02-19   
301-398 7 Washington Zone 10 MD 876D ONVOY, LLC - MD 236   2003-11-09   
301-398 8 Washington Zone 10 MD 876D ONVOY, LLC - MD 236   2003-11-09   
301-398 9 Washington Zone 10 MD 876D ONVOY, LLC - MD 236   2003-11-09   
301-409 0 Washington Zone 2 MD 876D ONVOY, LLC - MD 236   2022-04-25   
301-409 3 Washington Zone 2 MD 876D ONVOY, LLC - MD 236   2022-12-12   
301-409 4 Washington Zone 2 MD 876D ONVOY, LLC - MD 236   2022-12-12   
301-409 5 Washington Zone 2 MD 876D ONVOY, LLC - MD 236   2022-12-12   
301-409 6 Washington Zone 2 MD 876D ONVOY, LLC - MD 236   2022-12-12   
301-414 8 Damascus MD 876D ONVOY, LLC - MD 236   2016-03-11   
301-417 5 Washington Zone 10 MD 876D ONVOY, LLC - MD 236   2015-06-27   
301-433 7 Washington Zone 5 MD 876D ONVOY, LLC - MD 236   2015-06-27   
301-450 5 Washington Zone 3 MD 876D ONVOY, LLC - MD 236   2022-09-17   
301-450 6 Washington Zone 3 MD 876D ONVOY, LLC - MD 236   2022-09-17   
301-450 7 Washington Zone 3 MD 876D ONVOY, LLC - MD 236   2022-09-17   
301-450 8 Washington Zone 3 MD 876D ONVOY, LLC - MD 236   2022-09-17   
301-458 3 Washington Zone 4 MD 876D ONVOY, LLC - MD 236   2016-02-29   
301-477 0 Washington Zone 13 MD 876D ONVOY, LLC - MD 236   2024-09-15   
301-477 8 Washington Zone 13 MD 876D ONVOY, LLC - MD 236   2018-01-14   
301-477 9 Washington Zone 13 MD 876D ONVOY, LLC - MD 236   2018-01-14   
301-479 0 Washington Zone 13 MD 876D ONVOY, LLC - MD 236   2024-11-04   
301-479 5 Washington Zone 13 MD 876D ONVOY, LLC - MD 236   2023-06-17   

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

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