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: 319 [Rate centres in NPA 319] [Dial plan for NPA 319]

NXX: 503

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
319-503 A Cedar Rapids IA   478J NUSO, LLC 635   2025-04-24   
319-503 0 Cedar Rapids IA   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 635   2025-09-05   
319-503 1 Cedar Rapids IA   478J NUSO, LLC 635   2025-04-24   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.