Detroit is in the United States.
The Seventeenth United States Census , conducted by the Census Bureau , determined the resident population of the United States to be 150,697,361 , an increase of 14.5 percent over the 131,669,275 persons enumerated during the 1940 Census . The Ambassador Bridge ( officially the Ambassador International Bridge ) is a suspension bridge that connects Detroit , Michigan , United States , with Windsor , Ontario , Canada . Detroit . More recently , the population of Downtown Detroit , Midtown Detroit , and various other neighborhoods has increased . Downtown Detroit is the central business district and a residential area of the city of Detroit , Michigan , United States . The Midwestern United States , also referred to as the American Midwest or simply the Midwest , is one of the four geographic regions defined by the United States Census Bureau , occupying the northern central part of the United States of America .