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: 630 [Rate centres in NPA 630] [Dial plan for NPA 630]

NXX: 551

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
630-551 A Oswego IL OSWGILOSDS0  9329 ILLINOIS BELL TEL CO 358      
630-551 0 Oswego IL OSWGILOSDS0  9329 ILLINOIS BELL TEL CO 358      
630-551 1 Oswego IL OSWGILOSDS0  9329 ILLINOIS BELL TEL CO 358      
630-551 2 Oswego IL OSWGILOSDS0  9329 ILLINOIS BELL TEL CO 358      
630-551 3 Oswego IL OSWGILOSDS0  9329 ILLINOIS BELL TEL CO 358      
630-551 4 Oswego IL OSWGILOSDS0  9329 ILLINOIS BELL TEL CO 358      
630-551 5 Oswego IL BURGILAHGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2003-11-24   
630-551 6 Oswego IL BURGILAHGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2003-11-24   
630-551 7 Oswego IL OSWGILOSDS0  9329 ILLINOIS BELL TEL CO 358   2006-01-13   
630-551 8 Oswego IL CHCGILWBXDZ  984E BANDWIDTH.COM CLEC, LLC - IL 358   2008-12-12   
630-551 9 Oswego IL CHCGIL24DS3  4604 FIRST COMMUNICATIONS, LLC - IL 358   2000-11-02   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.