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: 550

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
667-550 A Columbia MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2026-08-21   
667-550 0 Columbia MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2026-10-09   
667-550 1 Columbia MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2026-10-09   
667-550 2 Columbia MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2026-10-09   
667-550 3 Columbia MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2026-10-09   
667-550 4 Columbia MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2026-08-21   
667-550 5 Columbia MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2026-08-21   
667-550 6 Columbia MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2026-08-21   
667-550 7 Columbia MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2026-08-21   
667-550 8 Columbia MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2026-08-21   
667-550 9 Columbia MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2026-08-21   

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

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