Prescott is a city in Yavapai County, Arizona, United States. According to 2010 Census, the population of the city is 39,843. The city is the county seat of Yavapai County. In 1864 Prescott was designated as the capital of the Arizona Territory, replacing the temporary capital at Fort Whipple. The Territorial Capital was moved to Tucson in 1867. Prescott again became the Territorial Capital in 1877, until Phoenix became the capital in 1889.