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: HSTNTXNEDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
713-491 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-491 0 Houston TX 9533 SOUTHWESTERN BELL 560      
713-491 1 Houston TX 9533 SOUTHWESTERN BELL 560      
713-491 5 Houston TX 9533 SOUTHWESTERN BELL 560      
713-491 7 Houston TX 9533 SOUTHWESTERN BELL 560      
713-491 8 Houston TX 9533 SOUTHWESTERN BELL 560      
713-491 9 Houston TX 9533 SOUTHWESTERN BELL 560      
713-497 0 Houston TX 9533 SOUTHWESTERN BELL 560      
713-631 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-631 0 Houston TX 9533 SOUTHWESTERN BELL 560      
713-631 1 Houston TX 9533 SOUTHWESTERN BELL 560      
713-631 2 Houston TX 9533 SOUTHWESTERN BELL 560      
713-631 3 Houston TX 9533 SOUTHWESTERN BELL 560      
713-631 4 Houston TX 9533 SOUTHWESTERN BELL 560      
713-631 5 Houston TX 9533 SOUTHWESTERN BELL 560      
713-631 6 Houston TX 9533 SOUTHWESTERN BELL 560      
713-631 7 Houston TX 9533 SOUTHWESTERN BELL 560      
713-631 8 Houston TX 9533 SOUTHWESTERN BELL 560      
713-633 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-635 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-635 0 Houston TX 9533 SOUTHWESTERN BELL 560      
713-635 1 Houston TX 9533 SOUTHWESTERN BELL 560      
713-635 2 Houston TX 9533 SOUTHWESTERN BELL 560      
713-635 3 Houston TX 9533 SOUTHWESTERN BELL 560      
713-635 4 Houston TX 9533 SOUTHWESTERN BELL 560      
713-635 5 Houston TX 9533 SOUTHWESTERN BELL 560      
713-635 6 Houston TX 9533 SOUTHWESTERN BELL 560      
713-635 7 Houston TX 9533 SOUTHWESTERN BELL 560      
713-635 8 Houston TX 9533 SOUTHWESTERN BELL 560      
713-636 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-636 4 Houston TX 9533 SOUTHWESTERN BELL 560      
713-636 6 Houston TX 9533 SOUTHWESTERN BELL 560      
713-636 7 Houston TX 9533 SOUTHWESTERN BELL 560      
713-636 8 Houston TX 9533 SOUTHWESTERN BELL 560      

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

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