A colony.
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The [human] population density.
com·mu·ni·ty/kəˈmyo͞onitē/Noun:A group of people living together in one place, esp. one practicing common ownership: "a community of nuns".All the people living in a particular area or place: "local communities".
The area of the three room's sums equals 292ft2
The community is the collection of different populations that live together in an area.
It is simply called its surface area.