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: 381

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
320-381 A Clarkfield MN STCDMNTOX3X  184D ONVOY, LLC - MN 626      
320-381 0 Clarkfield MN STCDMNTOX3X  184D ONVOY, LLC - MN 626   2019-02-25   
320-381 1 Clarkfield MN STCDMNTOX3X  184D ONVOY, LLC - MN 626   2017-12-24   
320-381 2 Clarkfield MN STCDMNTOX3X  184D ONVOY, LLC - MN 626   2021-03-11   
320-381 8 Clarkfield MN STCDMNTOX3X  184D ONVOY, LLC - MN 626   2019-02-25   
320-381 9 Clarkfield MN STCDMNTOXTX  073H TELNYX LLC 626   2020-07-12   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.