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: 815 [Rate centres in NPA 815] [Dial plan for NPA 815]

NXX: 552

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
815-552 A Lockport IL LCPTILLPDS0  9329 ILLINOIS BELL TEL CO 358      
815-552 0 Lockport IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2012-08-12   
815-552 1 Lockport IL   224C ONVOY, LLC 358   2012-10-01   
815-552 2 Lockport IL   318J COMCAST IP PHONE, LLC 358   2011-12-06   
815-552 3 Lockport IL   318J COMCAST IP PHONE, LLC 358   2013-10-25   
815-552 4 Lockport IL   829J PAETEC ITEL, LLC 358   2010-02-19   
815-552 5 Lockport IL   9329 ILLINOIS BELL TEL CO 358      
815-552 6 Lockport IL   460K FIRST COMMUNICATIONS, LLC 358   2014-05-04   
815-552 7 Lockport IL   508J CENTURYLINK COMMUNICATIONS, LLC 358   2013-06-28   
815-552 8 Lockport IL   224C ONVOY, LLC 358   2014-05-15   
815-552 9 Lockport IL   224C ONVOY, LLC 358   2016-09-01   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.