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: HSTNTXGLRP0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
713-330 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-330 0 Houston TX 9533 SOUTHWESTERN BELL 560      
713-330 1 Houston TX 9533 SOUTHWESTERN BELL 560      
713-330 2 Houston TX 9533 SOUTHWESTERN BELL 560      
713-330 4 Houston TX 9533 SOUTHWESTERN BELL 560      
713-330 7 Houston TX 9533 SOUTHWESTERN BELL 560      
713-330 8 Houston TX 9533 SOUTHWESTERN BELL 560      
713-450 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-451 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-453 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-453 0 Houston TX 9533 SOUTHWESTERN BELL 560      
713-453 1 Houston TX 9533 SOUTHWESTERN BELL 560      
713-453 2 Houston TX 9533 SOUTHWESTERN BELL 560      
713-453 3 Houston TX 9533 SOUTHWESTERN BELL 560      
713-453 4 Houston TX 9533 SOUTHWESTERN BELL 560      
713-453 5 Houston TX 9533 SOUTHWESTERN BELL 560      
713-453 6 Houston TX 9533 SOUTHWESTERN BELL 560      
713-453 7 Houston TX 9533 SOUTHWESTERN BELL 560      
713-453 8 Houston TX 9533 SOUTHWESTERN BELL 560      
713-455 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-637 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-637 0 Houston TX 9533 SOUTHWESTERN BELL 560      
713-637 2 Houston TX 9533 SOUTHWESTERN BELL 560      
713-637 3 Houston TX 9533 SOUTHWESTERN BELL 560      
713-637 6 Houston TX 9533 SOUTHWESTERN BELL 560      
713-637 7 Houston TX 9533 SOUTHWESTERN BELL 560      
713-637 8 Houston TX 9533 SOUTHWESTERN BELL 560      
713-909 A Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
713-909 1 Houston Suburban TX 9533 SOUTHWESTERN BELL 560   2010-12-12   

Last updated: Mon, 15 Sep 2025 02:24:40 UTC

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