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: 420

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
815-420 A Rockford IL RCFRILRTZMD  224C ONVOY, LLC 360      
815-420 0 Rockford IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 360   2023-09-24   
815-420 1 Rockford IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 360   2019-08-26   
815-420 2 Rockford IL   829J PAETEC ITEL, LLC 360   2018-04-13   
815-420 3 Rockford IL   224C ONVOY, LLC 360   2019-11-17   
815-420 4 Rockford IL   224C ONVOY, LLC 360   2019-11-17   
815-420 5 Rockford IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 360      
815-420 6 Rockford IL   224C ONVOY, LLC 360   2024-01-06   
815-420 7 Rockford IL   224C ONVOY, LLC 360   2023-04-08   
815-420 8 Rockford IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 360      
815-420 9 Rockford IL   224C ONVOY, LLC 360   2023-08-12   

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.