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.

Switch: THTCUTXCRS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
435-854 A Thatcher UT 4429 CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 660      
435-854 0 Thatcher UT 4429 CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 660      
435-854 1 Thatcher UT 4429 CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 660      
435-854 2 Thatcher UT 4429 CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 660      
435-854 3 Thatcher UT 4429 CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 660      
435-854 7 Thatcher UT 4429 CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 660      
435-854 8 Thatcher UT 4429 CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 660      
435-854 9 Thatcher UT 4429 CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 660      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.