Black Hawk is a home rule municipality located in Gilpin County, Colorado, United States. The population was 127 at the 2020 United States Census, making it the least populous city in Colorado. It was a mining settlement founded in 1859 during the Pike's Peak Gold Rush and is now a part of the Denver-Aurora-Lakewood, CO Metropolitan Statistical Area and the Front Range Urban Corridor. Black Hawk is located adjacent to Central City, another historic mining settlement in Gregory Gulch.