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.

Switch: OSWGILOSDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
630-551 A Oswego IL 9329 ILLINOIS BELL TEL CO 358      
630-551 0 Oswego IL 9329 ILLINOIS BELL TEL CO 358      
630-551 1 Oswego IL 9329 ILLINOIS BELL TEL CO 358      
630-551 2 Oswego IL 9329 ILLINOIS BELL TEL CO 358      
630-551 3 Oswego IL 9329 ILLINOIS BELL TEL CO 358      
630-551 4 Oswego IL 9329 ILLINOIS BELL TEL CO 358      
630-551 7 Oswego IL 9329 ILLINOIS BELL TEL CO 358      
630-554 A Oswego IL 9329 ILLINOIS BELL TEL CO 358      
630-636 5 Oswego IL 9329 ILLINOIS BELL TEL CO 358      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.