Coon Valley Township, Sac County, IowaCoon Valley Township is a township in Sac County, Iowa, United States.The township's elevation is listed as 1207 feet above mean sea level.HistoryCoon Valley Township was established in 1877. Its name comes from the fact that the Raccoon River flows through it.DemographicsAs of 2010, Coon Valley Township had 187 residents and 92 housing units.