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is a city in Jefferson County, Wisconsin, United States. It is located on the Rock River, a few miles upstream from Lake Koshkonong. In 1996, Money Magazine named Fort Atkinson "One of America's Hottest Little Boomtowns" . The population was 11,621 at the 2000 census.
According to the United States Census Bureau, the city has a total area of 5.5 square miles (14.2 km²), of which, 5.4 square miles (14.0 km²) of it is land and 0.1 square miles (0.2 km²) of it (1.64%) is water.