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.
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Switch: HSTNTXADRP0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
281-219 A Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-227 A Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-372 A Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-442 A Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-449 A Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-590 A Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-594 A Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-985 A Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-986 A Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-987 A Houston Suburban TX 9533 SOUTHWESTERN BELL 560      

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

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