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: HRMJILHMRS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
618-360 A Harmony (Jefferson) IL 9329 ILLINOIS BELL TEL CO 520      
618-360 0 Harmony (Jefferson) IL 9329 ILLINOIS BELL TEL CO 520      
618-755 A Harmony (Jefferson) IL 9329 ILLINOIS BELL TEL CO 520      
618-755 4 Harmony (Jefferson) IL 9329 ILLINOIS BELL TEL CO 520      
618-755 9 Harmony (Jefferson) IL 9329 ILLINOIS BELL TEL CO 520      

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.