The Flat Rock Assembly Plant is a Ford Motor Company automobile assembly plant located at 1 International Drive in Flat Rock, Michigan, within Metro Detroit. The facility covers 2,900,000 square feet (270,000 m²) of production space and employs approximately 3,510 hourly workers and 140 salaried workers. It currently manufactures the Ford Mustang.
The plant was originally built by Ford as the Michigan Casting Center in 1972, but it closed in 1981. In 1987, Mazda took over the site and established its first U.S. manufacturing facility, Mazda Motor Manufacturing USA. In 1992, Ford purchased a stake in the plant, and it was reorganized as the joint venture AutoAlliance International.[1] Mazda ended production there in 2012, after which the facility returned to full Ford ownership.[2]