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: 577

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
620-577 A Independence KS WCHTKSMBX2X  2240 LEVEL 3 COMMUNICATIONS, LLC - KS 532      
620-577 0 Independence KS   624H ONVOY SPECTRUM, LLC 532   2025-01-21   
620-577 1 Independence KS   5562 METROPCS, INC. 532   2021-09-24   
620-577 2 Independence KS   2240 LEVEL 3 COMMUNICATIONS, LLC - KS 532   2007-07-03   
620-577 3 Independence KS   145J TERRA NOVA TELECOM INC. 532   2023-08-06   
620-577 4 Independence KS   2240 LEVEL 3 COMMUNICATIONS, LLC - KS 532      
620-577 5 Independence KS   2240 LEVEL 3 COMMUNICATIONS, LLC - KS 532   2010-12-23   
620-577 6 Independence KS   986E BANDWIDTH.COM CLEC, LLC - KS 532   2022-01-01   
620-577 7 Independence KS   8995 TELEPORT COMMUNICATIONS AMERICA, LLC - KS 532   2009-07-02   
620-577 8 Independence KS   205F ONVOY, LLC - KS 532   2019-06-10   
620-577 9 Independence KS   205F ONVOY, LLC - KS 532   2019-06-10   

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.