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: 738

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
320-738 A Onamia MN STCDMNTOX3X  184D ONVOY, LLC - MN 626      
320-738 0 Onamia MN   184D ONVOY, LLC - MN 626   2016-05-06   
320-738 1 Onamia MN   5256 LEVEL 3 COMMUNICATIONS, LLC - MN 626   2011-05-27   
320-738 2 Onamia MN   184D ONVOY, LLC - MN 626   2017-11-06   
320-738 3 Onamia MN   184D ONVOY, LLC - MN 626   2021-05-24   
320-738 5 Onamia MN   184D ONVOY, LLC - MN 626   2007-02-16   
320-738 6 Onamia MN   8405 TELEPORT COMMUNICATIONS AMERICA, LLC - MN 626   2022-06-29   
320-738 7 Onamia MN   508J CENTURYLINK COMMUNICATIONS, LLC 626   2017-06-22   
320-738 8 Onamia MN   073H TELNYX LLC 626   2020-07-20   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.