You mixed up some units here: Brooklyn is way denser than SF (about twice as dense). Your SF number is people per square mile, not per square km. Same units,

You mixed up some units here: Brooklyn is way denser than SF (about twice as dense). Your SF number is people per square mile, not per square km. Same units, Brooklyn is ~35,300/m^2, SF ~18,500/m^2 Manhattan ~69,400/m^2 all from https://en.wikipedia.org/wiki/List_of_United_States_cities_by_population_density https://en.wikipedia.org/wiki/List_of_United_States_cities_b...