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: 504

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
337-504 A Lafayette LA LFYTLAMAXEZ  318J COMCAST IP PHONE, LLC 488      
337-504 0 Lafayette LA   150C VOICESTREAM GSM I, LLC 488   2021-07-09   
337-504 1 Lafayette LA   150C VOICESTREAM GSM I, LLC 488   2006-01-10   
337-504 2 Lafayette LA   318J COMCAST IP PHONE, LLC 488   2005-09-19   
337-504 3 Lafayette LA   318J COMCAST IP PHONE, LLC 488   2005-09-19   
337-504 4 Lafayette LA   318J COMCAST IP PHONE, LLC 488   2005-03-15   
337-504 5 Lafayette LA   318J COMCAST IP PHONE, LLC 488   2005-03-15   
337-504 7 Lafayette LA   3232 LEVEL 3 COMMUNICATIONS, LLC - LA 488   2012-10-06   
337-504 8 Lafayette LA   150C VOICESTREAM GSM I, LLC 488   2009-11-04   
337-504 9 Lafayette LA   150C VOICESTREAM GSM I, LLC 488   2009-01-16   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.