Wixom is a city in Oakland County in the U.S. state of Michigan. The population was 13,263 at the 2000 census. The city was home to the former Wixom Assembly Plant, which produced the Lincoln LS, the Ford Thunderbird, the Ford GT, and the Lincoln Town Car. The plant closed its doors on May 31, 2007. Wixom is home to several production and manufacturing businesses, including Trijicon, a leading manufacturer of night gun sights and night telescopic sights; Discraft, a leading manufacturer of flying discs for disc sports games like Ultimate; the U.S. headquarters of spark plug manufacturer NGK, and MAC Valves, Inc. , a manufacturer of pneumatic valves used in the automotive and packaging industries.