Local Calling Guide

Area code/prefix search

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Westminster, MD

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
667-484 7   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2026-01-14   
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 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2021-12-16   
667-788 1 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2021-12-16   
667-788 2 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-12-19   
667-788 3 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2022-06-07   
667-788 4 BLTQMD019MD  490J BOOST SUBSCRIBERCO L.L.C. 238   2022-12-20   
667-788 6 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2022-01-15   
667-788 7 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2022-01-15   
667-788 8 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2022-05-09   
667-788 9 BLTMMDCHX3Y  2596 QUANTUM TELECOMMUNICATIONS, INC. - MD 238   2021-12-06   

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

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