The Office of Management and Budget (OMB), a federal agency of the United States, defines the Detroit–Warren–Dearborn Metropolitan Statistical Area ( MSA) as the six counties of Lapeer, Livingston, Macomb, Oakland, St. These counties are sometimes referred to as the Detroit Tri-County Area and had a population of 3,862,888 as of the 2010 census with an area of 1,967.1 square miles (5,095 km 2). This urbanized area covers parts of the counties of Macomb, Oakland, and Wayne. The Detroit Urban Area, which serves as the metropolitan area's core, ranks as the 12th most populous in the United States, with a population of 3,776,890 as of the 2020 census and an area of 1,284.83 square miles (3,327.7 km 2).
See also: Michigan census statistical areas
