Fitchburg is a city in Dane County, Wisconsin, United States. The population was 29,609 at the 2020 census. Fitchburg is a suburb of Madison and is part of the Madison Metropolitan Statistical Area. Fitchburg consists of a mix of suburban neighborhoods closer to the border with the city of Madison, commercial and industrial properties, and more rural properties in the southern portion of the city.

Dane County is a county in the U.S. state of Wisconsin. As of the 2020 census, the population was 561,504, making it the second-most populous county in Wisconsin after Milwaukee County. The county seat is Madison, which is also the state capital.