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: 526

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
320-526 A Howard Lake MN MPLSMNCD9MD  5256 LEVEL 3 COMMUNICATIONS, LLC - MN 628      
320-526 0 Howard Lake MN   5256 LEVEL 3 COMMUNICATIONS, LLC - MN 628   2007-09-11   
320-526 1 Howard Lake MN   184D ONVOY, LLC - MN 628   2017-05-29   
320-526 2 Howard Lake MN   184D ONVOY, LLC - MN 628   2019-10-28   
320-526 5 Howard Lake MN   184D ONVOY, LLC - MN 628   2020-03-06   
320-526 6 Howard Lake MN   184D ONVOY, LLC - MN 628   2020-03-06   
320-526 7 Howard Lake MN   508J CENTURYLINK COMMUNICATIONS, LLC 628   2014-11-18   
320-526 8 Howard Lake MN   8405 TELEPORT COMMUNICATIONS AMERICA, LLC - MN 628   2022-08-02   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.