Flat Rock is a city in Wayne County of the U.S. state of Michigan. A very small portion of the city extends into Monroe County. As of the 2010 census, the city population was 9,878. Flat Rock is home to the AutoAlliance International manufacturing plant, co-owned by Ford Motor Company and Mazda Motor Corporation.
As of 2005 it produces the Mazda 6 and the 5th generation Ford Mustang. Flat Rock is the namesake of the famous Flat Rock Speedway, located in Berlin Charter Township in neighboring Monroe County.
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