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: 620 [Rate centres in NPA 620] [Dial plan for NPA 620]

NXX: 406

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
620-406 A Treece KS TULSOKTBXIZ  478J NUSO, LLC 538      
620-406 1 Treece KS TULSOKTBXIZ  478J NUSO, LLC 538   2020-10-27   
620-406 2 Treece KS TULSOKTBXFY  986E BANDWIDTH.COM CLEC, LLC - KS 538   2021-07-18   
620-406 3 Treece KS TULSOKTBXIZ  478J NUSO, LLC 538   2023-12-22   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.