Median incomes by state are available at Census.gov as of 2015, according to the U.S. Census Bureau. Using a spreadsheet format, the website offers household income information by state, applying two-year and three-year average medians. One spreadsheet uses three-year average medians and ranks states from highest to lowest income level.
Census.gov also provides historical data of median household income by state from 1984 to 2013, using two-year and three-year averages and single-year estimates, according to the U.S. Census Bureau. When using the data, the reader should take into account that the money income figures do not encompass the benefits that some families receive in non-monetary forms, such as housing subsidies, and health and educational benefits.