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: 527

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
573-527 A Birch Tree MO STLSMOWQDS2  093F ONVOY, LLC - MO 520      
573-527 0 Birch Tree MO   073H TELNYX LLC 520   2020-07-25   
573-527 1 Birch Tree MO   624H ONVOY SPECTRUM, LLC 520   2021-11-18   
573-527 2 Birch Tree MO   093F ONVOY, LLC - MO 520   2019-11-23   
573-527 3 Birch Tree MO   093F ONVOY, LLC - MO 520   2019-11-23   
573-527 4 Birch Tree MO   093F ONVOY, LLC - MO 520   2021-03-07   
573-527 5 Birch Tree MO   093F ONVOY, LLC - MO 520   2019-01-12   
573-527 6 Birch Tree MO   624H ONVOY SPECTRUM, LLC 520   2021-07-02   
573-527 7 Birch Tree MO   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 520   2022-08-24   
573-527 8 Birch Tree MO   624H ONVOY SPECTRUM, LLC 520   2021-11-16   
573-527 9 Birch Tree MO   624H ONVOY SPECTRUM, LLC 520   2021-11-16   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.