The Census Bureau reports income from several major household surveys and programs. Each of these surveys differs from the others in some way, such as the length and detail of its questionnaire, the number of households included (sample size), and the methodology used to collect and process the data. See Guidance about Sources to see which survey meets your specific needs, and Income Data by Source to access data from specific surveys.
Income, Poverty, and Health Insurance Coverage in the United States: 2011 (P60-243)
Household Income Inequality Within U.S. Counties: 2006-2010
Effect of Benefits and Taxes on Income and Poverty: 2009
Observations from the Interagency Technical Working Group on Developing a Supplemental Poverty Measure [DOC - 50k]
Model-based estimates of median household income for counties and states for 2008.
Income, Earnings, and Poverty from the American Community Survey
Income Inequality