Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 667 [Rate centres in NPA 667] [Dial plan for NPA 667]

NXX: 478

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
667-478 A Sykesville MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-05-12   
667-478 0 Sykesville MD   876D ONVOY, LLC - MD 238   2024-05-12   
667-478 1 Sykesville MD   876D ONVOY, LLC - MD 238   2024-05-12   
667-478 2 Sykesville MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-06-22   
667-478 3 Sykesville MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2025-11-27   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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