A Block is the smallest area unit used by the U.S. Census Bureau for counting statistics in the United States. As of 2010, the U.S. consists of 11,078,300 Census Blocks. Of them, 4,871,270 blocks totaling 4.61 million square kilometers were reported to have no population living inside them. Despite having a population of more than 310 million people, no one calls 47 percent of the USA "home".

Green shading indicates unoccupied Census Blocks. A single inhabitant is enough to color a block white. Further discussion of this map.

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