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
208-675 A Tygee Valley ID 689F ONVOY, LLC - ID 654      
307-218 A Sheridan WY 450F ONVOY, LLC - WY 654      
307-243 A Casper WY 450F ONVOY, LLC - WY 654      
307-296 A Cody WY 450F ONVOY, LLC - WY 654      
307-300 A Powell WY 450F ONVOY, LLC - WY 654      
307-316 A Cheyenne WY 450F ONVOY, LLC - WY 654      
307-317 A Cheyenne WY 450F ONVOY, LLC - WY 654      
307-342 A Jackson WY 450F ONVOY, LLC - WY 654      
307-357 A Laramie WY 450F ONVOY, LLC - WY 654      
307-372 A Douglas WY 450F ONVOY, LLC - WY 654      
307-417 A Rawlins WY 450F ONVOY, LLC - WY 654      
307-434 A Gillette WY 450F ONVOY, LLC - WY 654   2024-04-08   
307-442 A Evanston WY 450F ONVOY, LLC - WY 654   2024-05-04   
307-445 A Kemmerer WY 450F ONVOY, LLC - WY 654      
307-452 A Casper WY 450F ONVOY, LLC - WY 654   2024-07-21   
307-453 A Jackson WY 450F ONVOY, LLC - WY 654   2024-07-28   
307-454 A Riverton WY 450F ONVOY, LLC - WY 654   2024-07-29   
307-474 A Cody WY 450F ONVOY, LLC - WY 654   2025-02-02   
307-481 A Lusk WY 450F ONVOY, LLC - WY 654      
307-554 A Glenrock WY 450F ONVOY, LLC - WY 654      
307-556 A Riverton WY 450F ONVOY, LLC - WY 654      
307-667 A Rawlins WY 450F ONVOY, LLC - WY 654      
307-800 A Kemmerer WY 450F ONVOY, LLC - WY 654      
307-910 A Cheyenne WY 450F ONVOY, LLC - WY 654      
307-996 A Cheyenne WY 450F ONVOY, LLC - WY 654      
307-998 A Sheridan WY 450F ONVOY, LLC - WY 654   2024-08-05   
406-643 A North Parkman MT 453F ONVOY, LLC - MT 654      
406-840 A Silvertip MT 453F ONVOY, LLC - MT 654      
435-292 A Coalville UT 871E ONVOY, LLC - UT 660      

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

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