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.

Thermopolis, WY

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
307-480 A CSPRWYMAXMD  6010 NEW CINGULAR WIRELESS PCS, LLC 654      
307-480 0 CSPRWYMAXMD  6010 NEW CINGULAR WIRELESS PCS, LLC 654   2005-08-12   
307-480 1   792K CHARTER IP ENABLED SERVICES, LLC 654   2021-09-06   
307-480 8 CHYNWYMAXIX  6566 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 654   2013-05-30   
307-480 9 CSPRWYMAXMD  6010 NEW CINGULAR WIRELESS PCS, LLC 654   2018-04-22   
307-722 A CHYNWYVACM1  013B UNION TELEPHONE COMPANY 654      
307-864 A THRMWYXCRS1  3410 RT COMMUNICATIONS 654      
307-921 A CHYNWYMAXIX  6566 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 654      
307-921 0 CHYNWYMAXIX  6566 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 654      
307-921 1 CHYNWYMAXIX  6566 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 654      
307-921 2 CHYNWYMAXIX  6566 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 654      
307-921 3 CHYNWYMAXIX  6566 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 654   2010-11-15   
307-921 4 CHYNWYMAXIX  6566 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 654   2012-09-07   
307-921 6   145J TERRA NOVA TELECOM INC. 654   2025-07-14   
307-921 8 CHYNWYMAXIX  6566 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 654      
307-921 9 CHYNWYMAXIX  6566 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 654      

Last updated: Thu, 05 Feb 2026 23:41:55 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.