San Francisco is only 46.9 square miles. It is dense (17,246 people/sq.mile) but not as dense as NYC (27,016 people/sq.mile). http://en.wikipedia.org/wiki/List

San Francisco is only 46.9 square miles. It is dense (17,246 people/sq.mile) but not as dense as NYC (27,016 people/sq.mile). http://en.wikipedia.org/wiki/List_of_United_States_cities_by_population_density http://en.wikipedia.org/wiki/List_of_United_States_cities_by...