Median household income varies by county across the United States. Predominantly rural counties across parts of the South, Southwest, Midwest, and Appalachia have some of the lower median incomes in the country. Counties with higher median household incomes are generally located in the Boston-to-Washington corridor, in larger metropolitan statistical areas, and along the coasts. SOURCE: Data are from the 2006-2010 ACS 5-year estimates for median household income in the last 12 months (in 2010 inflation-adjusted dollars). The five year data uniquely give us insights into all parts of the nation, including the more rural and thinly-populated counties. NOTE: As is the case with all surveys, statistics from sample surveys are subject to sampling and nonsampling error. The data table includes specific margins of error. The scale for Alaska is at 33% of the scale for the coterminous United States. The scale for Hawaii is equal to the scale for the coterminous United States.