Mustang is a city in the southeastern corner of Canadian County, Oklahoma, United States. It is part of the Oklahoma City metropolita…Mustang is a city in the southeastern corner of Canadian County, Oklahoma, United States. It is part of the Oklahoma City metropolitan statistical area. Mustang's population was 19,879 at the 2020 census, a 14.3% increase from 17,398 in 2010. The city is now primarily known as a bedroom community for Oklahoma City.