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.

OCN: 3880 ALL WEST/WYOMING, INC.

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
307-364 5 Green River WY EVTNWY161MD  654   2018-06-26   
307-444 A Evanston WY EVTNWY161MD  654      
307-522 5 Rock Springs WY EVTNWY161MD  654   2018-06-26   
307-770 A Farson WY EVTNWY161MD  654      
307-770 5 Farson WY EVTNWY161MD  654   2020-06-21   
307-800 8 Kemmerer WY EVTNWY161MD  654   2016-03-31   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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