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: HSTNTXIDRP0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
713-340 A Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
713-340 0 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
713-340 1 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
713-340 2 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
713-340 3 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
713-413 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-413 0 Houston TX 9533 SOUTHWESTERN BELL 560      
713-413 1 Houston TX 9533 SOUTHWESTERN BELL 560      
713-413 2 Houston TX 9533 SOUTHWESTERN BELL 560      
713-413 3 Houston TX 9533 SOUTHWESTERN BELL 560      
713-413 4 Houston TX 9533 SOUTHWESTERN BELL 560      
713-413 5 Houston TX 9533 SOUTHWESTERN BELL 560      
713-413 6 Houston TX 9533 SOUTHWESTERN BELL 560      
713-413 8 Houston TX 9533 SOUTHWESTERN BELL 560      
713-413 9 Houston TX 9533 SOUTHWESTERN BELL 560      
713-433 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-434 A Houston TX 9533 SOUTHWESTERN BELL 560      
713-434 0 Houston TX 9533 SOUTHWESTERN BELL 560      
713-434 1 Houston TX 9533 SOUTHWESTERN BELL 560      
713-434 2 Houston TX 9533 SOUTHWESTERN BELL 560      
713-434 3 Houston TX 9533 SOUTHWESTERN BELL 560      
713-434 4 Houston TX 9533 SOUTHWESTERN BELL 560      
713-434 5 Houston TX 9533 SOUTHWESTERN BELL 560      
713-434 7 Houston TX 9533 SOUTHWESTERN BELL 560      
713-434 8 Houston TX 9533 SOUTHWESTERN BELL 560      
713-434 9 Houston TX 9533 SOUTHWESTERN BELL 560      
713-436 A Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
713-497 8 Houston TX 9533 SOUTHWESTERN BELL 560      

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

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