Troy is a city in Oakland County in the U.S. state of Michigan. A northern suburb of Detroit, Troy is located about 22 miles north of downtown Detroit. As of the 2020 census, the city had a population of 87,294, making Troy the largest community in Oakland County, and the 13th-most-populous municipality in the state. Troy was organized as a township in 1827, and sections of the township incorporated much later into the cities of Birmingham, Clawson, and Royal Oak.