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: 631

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
920-631 A Beaver Dam WI MILWWIHEWMD  516C AT&T CORP. 356      
920-631 0 Beaver Dam WI   939H COMMIO, LLC 356   2022-08-22   
920-631 1 Beaver Dam WI   007F BANDWIDTH.COM CLEC, LLC - WI 356   2022-03-10   
920-631 2 Beaver Dam WI   227F PEERLESS NETWORK OF WISCONSIN, LLC - WI 356   2020-05-31   
920-631 3 Beaver Dam WI   624H ONVOY SPECTRUM, LLC 356   2021-06-25   
920-631 4 Beaver Dam WI   007F BANDWIDTH.COM CLEC, LLC - WI 356   2022-03-10   
920-631 5 Beaver Dam WI   225C ONVOY, LLC - WI 356   2023-08-14   
920-631 6 Beaver Dam WI   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 356   2025-07-26   
920-631 7 Beaver Dam WI   516C AT&T CORP. 356   2010-02-13   
920-631 8 Beaver Dam WI   225C ONVOY, LLC - WI 356   2023-08-14   
920-631 9 Beaver Dam WI   225C ONVOY, LLC - WI 356   2023-08-14   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.