Thanks. btw, your up to the minute:
We actually reached 667,000 people in Jul of 2015. We actually, very likely have more because we're a sanctuary city.
We're at about 678~680,000 now which puts us just slightly above 14,000/ sq mi.
Also, someone said we're smaller than Philadelphia. In truth, quite barely. But, Philly's csa is about 25% bigger.
But if you add just Cambridge + Somerville to Boston's footprint, and you compare that to the densest equal land area of Philadelphia, we're either about the same, or denser. If you add Boston's densest non-incorporated communities until you fill Phily's footprint, we're within a couple of % or slightly above.
The Density if Boston + Cambridge + Somerville is 14,700/sq mi. If you add our students when school is in, and compare to San Francisco + it's students, our density is higher by about 2,500/sq mi.
i'll clarify the ambiguity with some more exact numbers later.