These are lists of the lowest-income counties in the United States, based on measures of per capita personal income and median household income. This article lists counties by per capita personal income (PCPI), a more comprehensive measurement of an individual's income than per capita income (PCI).
Two common measurements of the average annual income of individuals in the United States are: per capita income (PCI) and per capita personal income (PCPI). Per capita personal income is the more comprehensive of the two measures, and thus PCPI for an individual, county, or state will be higher than PCI. The following table is a listing of counties by PCPI. Many of these counties are home to prisons, which lowers their per capita personal incomes.