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: SXCYIA78X1X

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
531-307 A Homer NE 3233 LEVEL 3 COMMUNICATIONS, LLC - NE 630      
605-540 A North Sioux City SD 5180 LEVEL 3 COMMUNICATIONS, LLC - SD 630      
712-391 A Anthon IA 9877 LEVEL 3 COMMUNICATIONS, LLC - IA 630      
712-560 A Sioux City IA 9877 LEVEL 3 COMMUNICATIONS, LLC - IA 630      
712-587 A Sioux City IA 9877 LEVEL 3 COMMUNICATIONS, LLC - IA 630   2025-02-04   
712-631 A Sheldon IA 9877 LEVEL 3 COMMUNICATIONS, LLC - IA 630      
712-823 A Sergeant Bluff IA 9877 LEVEL 3 COMMUNICATIONS, LLC - IA 630      

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

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