San Francisco is the fourth-most dense city in America (among cities with >75,000 residents). If you only count cities with >200,000 residents, it's the second-

San Francisco is the fourth-most dense city in America (among cities with >75,000 residents). If you only count cities with >200,000 residents, it's the second-most dense city in America, behind NYC. Its overall density is 17k/mi2. https://en.wikipedia.org/wiki/List_of_United_States_cities_by_population_density https://en.wikipedia.org/wiki/List_of_United_States_cities_b... And if you look at entire metropolitan areas, rather than just cities, LA is actually the second-most dense metropolitan area in the country. Meanwhile, Phoenix, Arizona has a population density of 2k/mi2, and is having a massive outbreak. Public policy appears to be the determining factor in flattening the curve of COVID outbreaks, not density.