San Francisco is the 20th densest incorporated place in the US: http://en.wikipedia.org/wiki/List_of_United_States_cities_by_population_density http://en.wikipe

San Francisco is the 20th densest incorporated place in the US: http://en.wikipedia.org/wiki/List_of_United_States_cities_by_population_density http://en.wikipedia.org/wiki/List_of_United_States_cities_by... Cudahy, California is a city that's significantly denser than it. It's the 2nd-densest large city in the US, but that's because the dense core city is its own incorporated area, as opposed to most other American cities, which annexed many suburban areas throughout the 20th century. And most American cities are some of the least dense in the world— San Francisco doesn't even rate on a list of world cities: San Francisco doesn't even rate on a list of world And it's still only half as dense as Brooklyn.