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

Gilpin County is a county located in the U.S. state of Colorado, smallest in land area behind only the City and County of Broomfield. As of the 2020 census, the population was 5,808. The county seat is Central City. The county was formed in 1861, while Colorado was still a territory, and was named after Colonel William Gilpin, the first territorial governor.