Woodruff (CDP), WisconsinWoodruff is a census-designated place in the Town of Woodruff in Oneida County, Wisconsin, United States. As of the 2020 census, the population was 891.DescriptionWoodruff is located at the junction of U.S. Route 51, Wisconsin Highway 70 and Wisconsin Highway 47, northwest of Rhinelander. Woodruff has a post office with ZIP code 54568. As of the 2010 census, its population is 966. Woodruff has a hospital, the Howard Young Medical Center.