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: WTRLIADTDS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
319-226 A Waterloo IA 9631 QWEST CORPORATION 635      
319-232 A Waterloo IA 9631 QWEST CORPORATION 635      
319-233 A Waterloo IA 9631 QWEST CORPORATION 635      
319-234 A Waterloo IA 9631 QWEST CORPORATION 635      
319-235 A Waterloo IA 9631 QWEST CORPORATION 635      
319-236 A Waterloo IA 9631 QWEST CORPORATION 635      
319-272 A Waterloo IA 9631 QWEST CORPORATION 635      
319-274 A Waterloo IA 9631 QWEST CORPORATION 635      
319-287 A Waterloo IA 9631 QWEST CORPORATION 635      
319-291 A Waterloo IA 9631 QWEST CORPORATION 635      
319-292 A Waterloo IA 9631 QWEST CORPORATION 635      
319-833 A Waterloo IA 9631 QWEST CORPORATION 635      
319-874 A Waterloo IA 9631 QWEST CORPORATION 635      

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

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