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Yes. It's houses next to Boston. Boston itself has other stuff. People aren't supposed to live in the convention center, baseball stadium, or airport.

Looks very sparse compared to what? According to https://en.wikipedia.org/wiki/List_of_United_States_cities_b... it's the 16th densest city or town in the US. The only place in the US that is both denser and has more people is New York City.

Now you could argue that US cities are generally not that dense; NYC is half the density of Paris. But Amsterdam, say, is only 2/3 as dense as Somerville is. Berlin is even less dense than that (but I know its boundaries contain some serious chunks of park/woodland).

Each of those houses is home to two or three families.