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
443-238 0 Parkton MD 876D ONVOY, LLC - MD 238   2024-03-07   
443-238 1 Parkton MD 876D ONVOY, LLC - MD 238   2016-03-21   
443-238 3 Parkton MD 876D ONVOY, LLC - MD 238   2016-03-21   
443-241 A Westminster MD 876D ONVOY, LLC - MD 238      
443-242 9 Sparrows Point MD 876D ONVOY, LLC - MD 238   2023-10-22   
443-244 6 Westminster MD 876D ONVOY, LLC - MD 238   2016-03-10   
443-247 0 Union Bridge MD 876D ONVOY, LLC - MD 238   2019-02-19   
443-247 2 Union Bridge MD 876D ONVOY, LLC - MD 238   2019-02-19   
443-247 4 Union Bridge MD 876D ONVOY, LLC - MD 238   2016-03-28   
443-247 5 Union Bridge MD 876D ONVOY, LLC - MD 238   2016-03-28   
443-251 A Catonsville MD 876D ONVOY, LLC - MD 238      
443-251 0 Catonsville MD 876D ONVOY, LLC - MD 238   2014-09-05   
443-251 3 Catonsville MD 876D ONVOY, LLC - MD 238   2014-12-31   
443-251 4 Catonsville MD 876D ONVOY, LLC - MD 238   2014-12-31   
443-256 4 North East MD 876D ONVOY, LLC - MD 238   2014-09-20   
443-256 5 North East MD 876D ONVOY, LLC - MD 238   2014-09-20   
443-264 3 Pikesville MD 876D ONVOY, LLC - MD 238   2018-05-31   
443-266 9 Glenwood MD 876D ONVOY, LLC - MD 238   2012-10-07   
443-272 4 Randallstown MD 876D ONVOY, LLC - MD 238   2012-10-08   
443-273 5 Reisterstown MD 876D ONVOY, LLC - MD 238   2012-10-08   
443-274 4 Severn MD 876D ONVOY, LLC - MD 238   2012-02-29   
443-278 0 Baltimore MD 876D ONVOY, LLC - MD 238   2024-01-06   
443-278 1 Baltimore MD 876D ONVOY, LLC - MD 238   2024-01-06   
443-278 2 Baltimore MD 876D ONVOY, LLC - MD 238   2024-01-06   
443-284 0 Waterloo MD 876D ONVOY, LLC - MD 238   2026-01-11   
443-290 3 Parkville MD 876D ONVOY, LLC - MD 238   2016-03-29   
443-290 5 Parkville MD 876D ONVOY, LLC - MD 238   2012-10-07   
443-291 2 Hampstead MD 876D ONVOY, LLC - MD 238   2016-03-21   
443-291 5 Hampstead MD 876D ONVOY, LLC - MD 238   2024-03-08   
443-291 8 Hampstead MD 876D ONVOY, LLC - MD 238   2016-03-21   
443-292 9 Crofton MD 876D ONVOY, LLC - MD 238   2012-06-15   
443-293 0 Westminster MD 876D ONVOY, LLC - MD 238   2025-09-28   
443-293 1 Westminster MD 876D ONVOY, LLC - MD 238   2025-10-30   
443-293 5 Westminster MD 876D ONVOY, LLC - MD 238   2021-09-23   
443-294 7 West River MD 876D ONVOY, LLC - MD 238   2012-10-08   
443-296 0 Waterloo MD 876D ONVOY, LLC - MD 238   2024-12-02   
443-296 1 Waterloo MD 876D ONVOY, LLC - MD 238   2025-09-28   
443-296 5 Waterloo MD 876D ONVOY, LLC - MD 238   2012-10-08   
443-299 1 Fallston MD 876D ONVOY, LLC - MD 238   2025-10-12   
443-300 0 Sykesville MD 876D ONVOY, LLC - MD 238   2021-07-12   
443-300 1 Sykesville MD 876D ONVOY, LLC - MD 238   2021-04-29   
443-300 9 Sykesville MD 876D ONVOY, LLC - MD 238   2021-07-12   
443-302 3 Crofton MD 876D ONVOY, LLC - MD 238   2021-05-21   
443-302 8 Crofton MD 876D ONVOY, LLC - MD 238   2021-05-21   
443-305 5 Armiger-Gibson Island MD 876D ONVOY, LLC - MD 238   2021-03-04   
443-312 1 Brooklyn Park-Linthicum MD 876D ONVOY, LLC - MD 238   2025-01-06   
443-312 5 Brooklyn Park-Linthicum MD 876D ONVOY, LLC - MD 238   2021-09-23   
443-313 6 Fork MD 876D ONVOY, LLC - MD 238   2016-04-04   
443-313 7 Fork MD 876D ONVOY, LLC - MD 238   2016-04-04   
443-315 2 Catonsville MD 876D ONVOY, LLC - MD 238   2013-08-01   

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

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