Interesting graphs and charts department

[glatt]

That's the kind of statistic that seems poignant but actually tells you nothing. People live in cities. Counties are different geographical sizes. Metropolitan areas can be divided into counties differently.

I think LA is fortunate that it is all one county.

The DC metro area is split up between several counties in two states and a district and the Federal government has some jurisdiction over it too. Makes coordinating something regional, like the Metro for example, extremely difficult.