North America metropolitan area by population in North America: Greater Mexico City. Canada also breaks into the top ten largest metropolitan areas with the Toronto metropolitan area having six million people. The proximity of cities to each other on the Canada–United States border and Mexico–United States border has led to the rise of international metropolitan areas. These urban agglomerations are observed at their largest and most productive in Detroit–Windsor and San Diego–Tijuana and experience large commercial, economic, and cultural activity. The metropolitan areas are responsible for millions of dollars of trade dependent on international freight. In Detroit-Windsor the Border Transportation Partnership study
North America City – Windsor Corridor, Golden Horseshoe – both of which are considered part of the Great Lakes Megaregion – and megalopolis of Central Mexico. Traditionally the largest megaregion has been considered the Boston-Washington, DC Corridor, or the Northeast, as the region is one massive contiguous area. Yet have allowed the Great Lakes Megalopolis to maintain status as the most populated region, being home to 53,768,125 people in 2000. The top ten largest North American metropolitan areas by population as of 2013, based on national census numbers from the United States and census estimates from Canada and Mexico. North America's GDP