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: 636 [Rate centres in NPA 636] [Dial plan for NPA 636]

NXX: 741

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
636-741 A Imperial MO STLSMOGZWMD  829J PAETEC ITEL, LLC 520      
636-741 2 Imperial MO STLSMOWQDS2  093F ONVOY, LLC - MO 520   2016-03-26   
636-741 3 Imperial MO STLTMOBODS1  7432 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 520   2011-03-01   
636-741 4 Imperial MO STLSMOWQDS2  093F ONVOY, LLC - MO 520   2016-03-26   
636-741 5 Imperial MO STLSMOGZWMD  829J PAETEC ITEL, LLC 520      
636-741 7 Imperial MO WNVLMOXAXBX  508J CENTURYLINK COMMUNICATIONS, LLC 520   2014-05-05   

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.