A household consists of all the people who occupy a housing unit. A house, an apartment or other group of rooms, or a single room, is regarded as a housing unit when it is occupied or intended for occupancy as separate living quarters.
A household includes the related family members and all the unrelated people, if any, such as lodgers, foster children, wards, or employees who share the housing unit. A person living alone in a housing unit, or a group of unrelated people sharing a housing unit such as partners or roomers, is also counted as a household.
The 3-year average median is the sum of 3 inflation-adjusted single-year medians divided by 3.

U.S. Census Bureau, Current Population Survey, 2006 to 2008 Annual Social and Economic Supplements. Three-Year-Average Median Household Income by State: 2006-2008, available at http://www.census.gov/hhes/www/income/income08/statemhi3_08.xls and Two-Year-Average Median Household Income by State: 2005 to 2008, available at http://www.census.gov/hhes/www/income/income08/statemhi2_08.xls.

NA: Not Available.

1. U.S. median income based on two-year average for 2007-2008.