Central City is a home rule municipality located in Gilpin and Clear Creek counties, Colorado, United States. Central City is the county seat and the most populous municipality of Gilpin County. The city population was 779, all in Gilpin County, at the 2020 United States census. The city is a historic mining settlement founded in 1859 during the Pike's Peak Gold Rush and came to be known as the "Richest Square Mile on Earth".