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: 387

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
319-387 A Central City IA CDRRIADTHMD  624H ONVOY SPECTRUM, LLC 635      
319-387 0 Central City IA   221F ONVOY, LLC - IA 635   2023-09-10   
319-387 2 Central City IA   221F ONVOY, LLC - IA 635   2021-11-24   
319-387 3 Central City IA   624H ONVOY SPECTRUM, LLC 635   2021-08-21   
319-387 4 Central City IA   221F ONVOY, LLC - IA 635   2022-08-22   
319-387 5 Central City IA   624H ONVOY SPECTRUM, LLC 635   2021-11-12   
319-387 6 Central City IA   624H ONVOY SPECTRUM, LLC 635   2021-11-12   
319-387 7 Central City IA   221F ONVOY, LLC - IA 635   2021-09-24   
319-387 8 Central City IA   221F ONVOY, LLC - IA 635   2022-10-13   
319-387 9 Central City IA   624H ONVOY SPECTRUM, LLC 635   2021-12-20   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.