Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 667 [Rate centres in NPA 667] [Dial plan for NPA 667]

NXX: 503

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
667-503 A Baltimore MD   624H ONVOY SPECTRUM, LLC 238   2025-03-22   
667-503 0 Baltimore MD   624H ONVOY SPECTRUM, LLC 238   2025-03-22   
667-503 1 Baltimore MD   624H ONVOY SPECTRUM, LLC 238   2025-03-22   
667-503 2 Baltimore MD   624H ONVOY SPECTRUM, LLC 238   2025-03-22   
667-503 3 Baltimore MD   624H ONVOY SPECTRUM, LLC 238   2025-03-22   
667-503 4 Baltimore MD   624H ONVOY SPECTRUM, LLC 238   2025-03-22   
667-503 5 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-03-24   
667-503 6 Baltimore MD   876D ONVOY, LLC - MD 238   2025-03-24   
667-503 7 Baltimore MD   876D ONVOY, LLC - MD 238   2025-03-24   
667-503 8 Baltimore MD   876D ONVOY, LLC - MD 238   2025-03-24   
667-503 9 Baltimore MD   876D ONVOY, LLC - MD 238   2025-03-24   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.