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: 320 [Rate centres in NPA 320] [Dial plan for NPA 320]

NXX: 278

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
320-278 A Terrace MN TRRCMNXTRP0  1433 MID STATE TEL. CO. 626      
320-278 3 Terrace MN TRRCMNXTRP0  1433 MID STATE TEL. CO. 626      
320-278 4 Terrace MN   624H ONVOY SPECTRUM, LLC 626   2025-02-08   
320-278 5 Terrace MN STCDMNTOX3X  184D ONVOY, LLC - MN 626   2021-03-11   
320-278 6 Terrace MN STCDMNTOX3X  184D ONVOY, LLC - MN 626   2021-04-07   
320-278 7 Terrace MN STCDMNTOX3X  184D ONVOY, LLC - MN 626   2020-06-13   
320-278 8 Terrace MN STCDMNTOX3X  184D ONVOY, LLC - MN 626   2023-09-03   
320-278 9 Terrace MN STCDMNTOX3X  184D ONVOY, LLC - MN 626   2022-01-07   

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.