Plato, Missouri: Population 109 —
Caleb Patterson, 4, rests beneath a flatbed trailer during a church picnic held near Plato, Missouri, in 2012. Plato is the "mean center of population" for the United States. That means, according to the U.S. Census Bureau, it's the place "where an imaginary, flat, weightless and rigid map of the United States would balance perfectly if all residents were of identical weight."