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

NXX: 475

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
667-475 A Crofton MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-05-12   
667-475 0 Crofton MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-05-12   
667-475 9 Crofton MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2024-12-19   

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

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