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: EVTNWYBHW00

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
307-255 A Evanston WY 1772 UINTAH BASIN ELECTRONIC TELECOMMUNICATIONS 654   2024-01-16   
307-297 A Green River WY 1772 UINTAH BASIN ELECTRONIC TELECOMMUNICATIONS 654   2024-01-16   

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

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