Sparta is a city in and the county seat of Monroe County, Wisconsin, United States, along the La Crosse River. According to the United States Census Bureau, the city has a total area of 5.5 square miles (14.3 sq. km), of which, 5.5 square miles (14.2 sq. km) of it is land and 0.1 square miles (0.2 sq. km) of it (1.09%) is water.