Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Westminster, MD

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
667-484 8   876D ONVOY, LLC - MD 238   2025-11-28   
667-484 9   876D ONVOY, LLC - MD 238   2025-04-06   
667-788 A BLTMMD91DS2  2596 QUANTUM TELECOMMUNICATIONS, INC. - MD 238      
667-788 0   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2021-12-16   
667-788 1   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2021-12-16   
667-788 2   876D ONVOY, LLC - MD 238   2021-12-19   
667-788 3   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2022-06-07   
667-788 4   490J DISH WIRELESS, LLC 238   2022-12-20   
667-788 6   624H ONVOY SPECTRUM, LLC 238   2022-01-15   
667-788 7   624H ONVOY SPECTRUM, LLC 238   2022-01-15   
667-788 8   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2022-05-09   
667-788 9   2596 QUANTUM TELECOMMUNICATIONS, INC. - MD 238   2021-12-06   

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Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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