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: 573 [Rate centres in NPA 573] [Dial plan for NPA 573]

NXX: 621

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
573-621 A Sikeston MO STLTMOBOAMD  5814 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 520      
573-621 0 Sikeston MO   5814 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 520      
573-621 1 Sikeston MO   515J IP HORIZON LLC 520   2013-12-19   
573-621 2 Sikeston MO   993E BANDWIDTH.COM CLEC, LLC - MO 520   2014-03-31   
573-621 3 Sikeston MO   7432 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 520   2010-04-10   
573-621 4 Sikeston MO   993E BANDWIDTH.COM CLEC, LLC - MO 520   2015-09-21   
573-621 5 Sikeston MO   516C AT&T CORP. 520   2011-10-20   
573-621 6 Sikeston MO   5562 METROPCS, INC. 520   2017-02-27   
573-621 7 Sikeston MO   7218 TELEPORT COMMUNICATIONS AMERICA, LLC - MO 520   2008-11-05   
573-621 8 Sikeston MO   093F ONVOY, LLC - MO 520   2016-09-29   
573-621 9 Sikeston MO   6529 T-MOBILE USA, INC. 520   2021-04-16   

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.