Stoughton is a city in Dane County, Wisconsin, United States. It straddles the Yahara River about 20 miles southeast of the capital, Madison. Stoughton is part of the Madison Metropolitan Statistical Area. Its estimated population in 2004 was 12,692. Stoughton is known for its Norwegian heritage: It hosts a citywide celebration of Syttende Mai, the Norwegian constitution day, on the weekend closest to May 17. Its sister city is Gjøvik, Norway. Part of the city's celebration of its Norwegian heritage is the Stoughton Norwegian Dancers dance group, sponsored by Stoughton High School.