United States American middle class Household income in the United States Personal income in the United States Poorest places in the United States Poverty and health in the United States Poverty in the United States Social class in American history Social class in the United States Wealth inequality in the United States References External links US Census Bureau's official online income statistics forum Income distribution and income by race, US Census Bureau 2005 Household income by educational attainment, US Census Bureau Personal income in 2004, US Census Bureau Median Family Income by Family Size (in 2004 inflation-adjusted dollars) from Census.gov Median Family Income by Number of Earners in Family (in 2004 inflation-adjusted dollars) from Census.gov Working Definitions ClassMatters.com How Class Works, The New York Times Social class in the United States Poverty in the United States