Also thanks to Waronxmas for the cool link - reps to you
I think SF with water on two sides is significantly impacted, also LA for being considered sprawling is quite impressive at 1.2 million.
Here is the 5 Mile radius numbers in millions
1. NYC 2.4
2. LA 1.2
3. Philadelphia 1.0
4. Boston 0.9
5. Chicago 0.9
6. DC 0.7
7. Miami 0.6
8. Houston 0.5
9. Detroit 0.5
10. DFW 0.4
11. SF 0.4
12. Atlanta 0.4