Detroit is in North America.
Detroit . The municipality of Detroit had a 2015 estimated population of 677,116 , making it the 21st-most populous city in the United States . The metropolitan area , known as Metro Detroit , is home to 4.3 million people , making it the second-largest in the Midwest . The Detroit Metropolitan Airport is among the most important hubs in the United States . The City of Detroit anchors the second-largest economic region in the Midwest , behind Chicago , and the thirteenth-largest in the United States . Detroit and its neighboring Canadian city Windsor are connected through a tunnel and the Ambassador Bridge , the busiest international crossing in North America .