In the United States, Detroit is the 21st-most populous city.
== Geography ===== Metropolitan area ===Detroit is the center of a three-county urban area (with a population of 3,734,090 within an area of 1,337 square miles (3,460 km2) according to the 2010 United States Census), six-county metropolitan statistical area (population of 4,296,250 in an area of 3,913 square miles [10,130 km2] as of the 2010 census), and a nine-county Combined Statistical Area (population of 5
 Census Bureau reported 331,449,281 residents as of April 1, 2020, making the United States the third most populous nation in the world, after China and India

