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: 425

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
319-425 A Anamosa IA CDRRIAAXMMD  351F MARTELLE COOP TEL ASC DBA MARTELLE COMM COOP IA 635      

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.