[Retric]

https://en.wikipedia.org/wiki/Paris

  DC has 158.1 km2 with 681,170 people or 4,308 people per km ^2.

  Paris has 105.4 km2 with 2,265,886 people or 250,065 people per km2

In other words DC has less than 2% of Paris's population density. Note, Paris is a turist destination so many shot's look like DC, but this is the real city: http://i.dailymail.co.uk/i/pix/2015/04/15/17/278DF7CF0000057...

[LordKano]

DC would have a much greater population density if developers were permitted to build upwards.

https://en.wikipedia.org/wiki/Height_of_Buildings_Act_of_191...