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: 608 [Rate centres in NPA 608] [Dial plan for NPA 608]

NXX: 594

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
608-594 A Plain WI MDSNWI11XAX  225C ONVOY, LLC - WI 354      
608-594 3 Plain WI   624H ONVOY SPECTRUM, LLC 354   2021-06-24   
608-594 4 Plain WI   225C ONVOY, LLC - WI 354   2021-02-19   
608-594 5 Plain WI   225C ONVOY, LLC - WI 354   2021-02-19   
608-594 6 Plain WI   225C ONVOY, LLC - WI 354   2021-02-19   
608-594 7 Plain WI   225C ONVOY, LLC - WI 354   2021-02-19   
608-594 9 Plain WI   145J TERRA NOVA TELECOM INC. 354   2025-08-22   

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.