Reedsburg is a city in Sauk County, Wisconsin, United States. Its population in 2020 was 9,984. The city is located 55 miles (89 km) northwest of Madison within the Baraboo micropolitan area. The city is surrounded by the Town of Reedsburg and is situated along the Baraboo River. It is the second-largest city in Sauk County after Baraboo, with a population of 9,984 at the time of the 2020 United States census.