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.

NPA: 307 [Rate centres in NPA 307] [Dial plan for NPA 307]

NXX: 655

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
307-655 A Sheridan WY DNRHWYMARS1  9636 QWEST CORPORATION 654      
307-655 0 Sheridan WY   9636 QWEST CORPORATION 654      
307-655 1 Sheridan WY   081F BANDWIDTH.COM CLEC, LLC - WY 654   2011-01-16   
307-655 2 Sheridan WY   9636 QWEST CORPORATION 654      
307-655 3 Sheridan WY   9636 QWEST CORPORATION 654      
307-655 4 Sheridan WY   7466 TRI TEL, INC. 654   2010-02-19   
307-655 5 Sheridan WY   009E BRESNAN BROADBAND OF WYOMING, LLC - WY [CHARTER] 654   2005-07-30   
307-655 6 Sheridan WY   081F BANDWIDTH.COM CLEC, LLC - WY 654   2010-06-25   
307-655 7 Sheridan WY   450F ONVOY, LLC - WY 654   2006-11-05   
307-655 8 Sheridan WY   009E BRESNAN BROADBAND OF WYOMING, LLC - WY [CHARTER] 654   2008-11-21   
307-655 9 Sheridan WY   9636 QWEST CORPORATION 654      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.