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.

Spring Valley, WI

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
715-778 A SPVYWIXARS0  0953 SPRING VALLEY TEL. CO., INC. 352      
715-987 A EUCLWIAU3MD  5489 LEVEL 3 COMMUNICATIONS, LLC - WI 352      
715-987 7 EUCLWIAU3MD  5489 LEVEL 3 COMMUNICATIONS, LLC - WI 352   2022-08-16   

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.