There is also the Town of Spring Valley, a subdivision of Rock County.Spring Valley is a village in Pierce and St. Croix Counties in the U.S. state of Wisconsin. The population was 1,352 at the 2010 census. Of this, 1,346 were in Pierce County, and only 6 were in St. Croix County. The village is located mostly within the Town of Spring Lake in Pierce County. Small portions also lie in the Town of Gilman, also in Pierce County, and the Town of Cady in St. Croix County.