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: 435 [Rate centres in NPA 435] [Dial plan for NPA 435]

NXX: 304

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
435-304 A Richfield UT WVCYUTBXDS0  7530 TELEPORT COMMUNICATIONS AMERICA, LLC - UT 660      
435-304 0 Richfield UT   7530 TELEPORT COMMUNICATIONS AMERICA, LLC - UT 660      
435-304 1 Richfield UT   7530 TELEPORT COMMUNICATIONS AMERICA, LLC - UT 660      
435-304 4 Richfield UT   7530 TELEPORT COMMUNICATIONS AMERICA, LLC - UT 660      
435-304 6 Richfield UT   871E ONVOY, LLC - UT 660   2012-12-20   
435-304 9 Richfield UT   7530 TELEPORT COMMUNICATIONS AMERICA, LLC - UT 660      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.