Among all children under 18 years in the U.S., 41 percent are low-income children and 19 percent--approximately one in five--are poor. This means that children are overrepresented among the nation's poor; they represent 23 percent of the population but comprise 32 percent of all people in poverty. Many more children live in families with incomes just above the poverty threshold. Being a child in a low-income or poor family does not happen by chance. Parental education and employment, race/ethnicity, and other factors are associated with children's experience of economic insecurity. This fact sheet describes the demographic, socioeconomic, and geographic characteristics of children and their parents. It highlights the important factors that appear to distinguish low-income and poor children from their more advantaged counterparts.