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: 779 [Rate centres in NPA 779] [Dial plan for NPA 779]

NXX: 373

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
779-373 A Rockford IL RCFRILRCXFX  475J CALLWORKS CORPORATION 360      
779-373 0 Rockford IL   6265 UNITED STATES CELLULAR - IL 360   2024-10-31   
779-373 1 Rockford IL RCFRILRCXFX  475J CALLWORKS CORPORATION 360   2023-09-10   
779-373 8 Rockford IL RCFRILRTXGY  6265 UNITED STATES CELLULAR - IL 360   2024-10-31   
779-373 9 Rockford IL RCFRILRTXGY  6265 UNITED STATES CELLULAR - IL 360   2024-10-31   

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.