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: 810 [Rate centres in NPA 810] [Dial plan for NPA 810]

NXX: 637

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
810-637 A St Clair MI SFLDMIDNDS6  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 340      
810-637 1 St Clair MI SFLDMIMNXRX  991E BANDWIDTH.COM CLEC, LLC - MI 340   2009-03-07   
810-637 2 St Clair MI SFLDMIDNDS5  9714 GRID 4 COMMUNICATIONS, INC. - MI 340   2010-07-21   
810-637 3 St Clair MI SFLDMIDICA0  2550 123.NET, INC. 340   2003-01-24   
810-637 4 St Clair MI SFLDMIDNDS6  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 340   2004-01-17   
810-637 5 St Clair MI SFLDMIDNDS6  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 340   2005-05-29   
810-637 6 St Clair MI DTRTMIBHMMD  0975 LONG DISTANCE OF MICHIGAN, INC. DBA LDMI - MI 340   2004-01-13   
810-637 7 St Clair MI DTRTMIBHMMD  8685 US XCHANGE OF MICHIGAN LLC DBA CHOICE ONE COMM MI 340   2009-10-26   
810-637 8 St Clair MI WAYNMIMNXUX  318J COMCAST IP PHONE, LLC 340   2005-11-15   
810-637 9 St Clair MI SFLDMIMK9MD  145J TERRA NOVA TELECOM INC. 340   2022-11-02   

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.