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: SXCYIADTDS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
605-232 A North Sioux City SD 9631 QWEST CORPORATION 630      
605-235 A North Sioux City SD 9631 QWEST CORPORATION 630      
712-233 A Sioux City IA 9631 QWEST CORPORATION 630      
712-234 A Sioux City IA 9631 QWEST CORPORATION 630      
712-252 A Sioux City IA 9631 QWEST CORPORATION 630      
712-255 A Sioux City IA 9631 QWEST CORPORATION 630      
712-258 A Sioux City IA 9631 QWEST CORPORATION 630      
712-277 A Sioux City IA 9631 QWEST CORPORATION 630      
712-279 A Sioux City IA 9631 QWEST CORPORATION 630      
712-293 A Sioux City IA 9631 QWEST CORPORATION 630      
712-294 A Sioux City IA 9631 QWEST CORPORATION 630      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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