Southfield is a city in Oakland County in the U.S. state of Michigan. An inner-ring suburb of Detroit, Southfield borders Detroit to the north, lying roughly 15 miles northwest of downtown. As of the 2020 census, the city had a population of 76,618.Southfield is notable as the home of multiple business districts, including the Southfield City Centre and the area surrounding the former Northland Center shopping mall. It is also home to Lawrence Technological University.