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: HSTNTXGRDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
713-456 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-472 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-473 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-475 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-477 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-534 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-589 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-740 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-920 A Houston TX 9533 SOUTHWESTERN BELL 560      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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