The City of Fort Atkinson is a vibrant community located along the Rock River, a few miles upstream from Lake Koshkonong, in Jefferson County. Fort Atkinson is the largest city located entirely in the county and named after General Henry Atkinson. Fort Atkinson was developed at the site of Fort Koshkonong, which was used during the Black Hawk War. The City is home to 10 parks and boasts a robust school system.