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: 920 [Rate centres in NPA 920] [Dial plan for NPA 920]

NXX: 320

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
920-320 A Manitowoc WI MNTWWI01DS0  9327 WISCONSIN BELL INC 356      
920-320 0 Manitowoc WI   073H TELNYX LLC 356   2017-03-14   
920-320 1 Manitowoc WI   007F BANDWIDTH.COM CLEC, LLC - WI 356   2011-02-28   
920-320 2 Manitowoc WI   9327 WISCONSIN BELL INC 356   2005-06-10   
920-320 3 Manitowoc WI   9327 WISCONSIN BELL INC 356   2005-06-10   
920-320 4 Manitowoc WI   9327 WISCONSIN BELL INC 356   2005-06-24   
920-320 5 Manitowoc WI   9327 WISCONSIN BELL INC 356   2005-06-10   
920-320 6 Manitowoc WI   9327 WISCONSIN BELL INC 356   2005-06-10   
920-320 7 Manitowoc WI   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 356   2021-04-19   
920-320 8 Manitowoc WI   9327 WISCONSIN BELL INC 356   2005-06-10   
920-320 9 Manitowoc WI   007F BANDWIDTH.COM CLEC, LLC - WI 356   2008-11-22   

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.