[fierarul]

The USA has a surface of 9.834.000 km². California is ranked #17 within the US based on population density and has only 97 people / km².

The Bay Area seems to have 18,000 km² which at 7.1 million people makes is quite dense already.

[zootam]

All of long island has 7.5 million people, at 5,617 people per square mile.

The bay area average is 868 people/sq mile.

No, the bay area is not dense at all.