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: 441

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
320-441 A Willmar MN STCDMNTOX3X  184D ONVOY, LLC - MN 626      
320-441 0 Willmar MN   184D ONVOY, LLC - MN 626      
320-441 1 Willmar MN   184D ONVOY, LLC - MN 626      
320-441 2 Willmar MN   792K CHARTER IP ENABLED SERVICES, LLC 626   2012-07-16   
320-441 3 Willmar MN   6701 AERIAL COMMUNICATIONS, INC. 626   2018-11-12   
320-441 4 Willmar MN   184D ONVOY, LLC - MN 626   2011-11-18   
320-441 5 Willmar MN   184D ONVOY, LLC - MN 626      
320-441 6 Willmar MN   184D ONVOY, LLC - MN 626      
320-441 7 Willmar MN   184D ONVOY, LLC - MN 626      
320-441 8 Willmar MN   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 626   2010-12-13   
320-441 9 Willmar MN   5816 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MN 626   2011-09-23   

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.