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.

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
319-238 A Oelwein IA 221F ONVOY, LLC - IA 635      
319-319 A Iowa City IA 221F ONVOY, LLC - IA 635      
319-413 A Troy Mills IA 221F ONVOY, LLC - IA 635      
319-420 A Waterloo IA 221F ONVOY, LLC - IA 635      
319-422 A Parkersburg IA 221F ONVOY, LLC - IA 635      
319-432 A Cedar Rapids IA 221F ONVOY, LLC - IA 635      
319-449 A Cedar Rapids IA 221F ONVOY, LLC - IA 635      
319-468 A Independence IA 221F ONVOY, LLC - IA 635      
319-487 A Cedar Rapids IA 221F ONVOY, LLC - IA 635   2024-05-19   
319-490 A Cedar Falls IA 221F ONVOY, LLC - IA 635   2024-06-20   
319-492 A Iowa City IA 221F ONVOY, LLC - IA 635   2024-08-09   
319-538 A Cedar Rapids IA 221F ONVOY, LLC - IA 635      
319-539 A Riverside IA 221F ONVOY, LLC - IA 635      
319-575 A Cedar Falls IA 221F ONVOY, LLC - IA 635      
319-602 A Hudson IA 221F ONVOY, LLC - IA 635      
319-712 A Walker IA 221F ONVOY, LLC - IA 635   2024-08-06   
319-719 A Vinton IA 221F ONVOY, LLC - IA 635      
319-727 A Coggon IA 221F ONVOY, LLC - IA 635      
319-933 A Janesville IA 221F ONVOY, LLC - IA 635      
507-502 A North Chester MN 184D ONVOY, LLC - MN 635      
563-276 A Waukon IA 221F ONVOY, LLC - IA 635      
563-297 A Arlington IA 221F ONVOY, LLC - IA 635      
563-800 A Calmar IA 221F ONVOY, LLC - IA 635      

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

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