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: 337 [Rate centres in NPA 337] [Dial plan for NPA 337]

NXX: 604

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
337-604 A Cecelia LA LFYTLAMAX9Y  749E ONVOY, LLC - LA 488      
337-604 0 Cecelia LA   153F BANDWIDTH.COM CLEC, LLC - LA 488   2025-12-11   
337-604 2 Cecelia LA LFYTLAMAX9Y  749E ONVOY, LLC - LA 488   2023-10-23   

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.