Rochester is a city in Oakland County in the U.S. state of Michigan. The population was 12,711 at the 2010 census. It is a northern suburb in Metro Detroit located 20 miles north of the city of Detroit. Rochester was the first European settlement in Oakland County when it was founded in 1818. It became part of the Avon Township in 1835 and incorporated as an autonomous city in 1967. It is mostly surrounded by the city of Rochester Hills and also borders Shelby Township to the east.