There were four hundred thousand people killed in the genocide in Darfur.
U.S. Cellular Field can hold 40,615 people. Four hundred thousand people would fill it 9 times.
Naperville, one of the largest cities in Illinois, has a population of 142,773. Four hundred thousand people would be about 3 Napervilles.
University of Illinois at Urbana-Champaign is one of the largest colleges in Illinois and graduates an average of 6,419 students per year. It would take 63 years for this school to graduate four hundred thousand students.
Willis Tower is one of the tallest buildings in Illinois (110 floors). A stack of four hundred thousand pennies would be as tall as 1 Willis Tower.
Comparing to data near Naperville, Illinois. (click to change)