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: HSTQTXRG6MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
281-281 A Houston Suburban TX 473F USFON, INC. - TX 560      
346-346 A Friendswood TX 473F USFON, INC. - TX 560      
713-713 A Houston TX 473F USFON, INC. - TX 560      
832-832 A Spring TX 473F USFON, INC. - TX 560      
936-777 A Conroe TX 139F WORLDCALL INTERCONNECT INC. 560      
936-888 A Hudson (Angelina) TX 139F WORLDCALL INTERCONNECT INC. 560      
936-999 A Zavalla TX 139F WORLDCALL INTERCONNECT INC. 560      
979-283 A Louise TX 139F WORLDCALL INTERCONNECT INC. 560      
979-444 A Carmine TX 139F WORLDCALL INTERCONNECT INC. 560      
979-989 A Markham TX 139F WORLDCALL INTERCONNECT INC. 560      
979-998 A Industry TX 139F WORLDCALL INTERCONNECT INC. 560      
979-999 A Garwood TX 139F WORLDCALL INTERCONNECT INC. 560      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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