Income inequality is measured by the index of concentration at the extremes (ICE), which represents the degree to which an area's residents are concentrated at the extremes of deprivation and privilege: a value of -1 means that 100% of the population is concentrated in the most deprived group (at or below the 20th percentile of income distribution), and a value of 1 means that 100% of the population is concentrated in the most privileged group (at or above the 80th percentile of income distribution).
American Community Survey (Census)
Years of Collection
2010-2014 (5-year estimates)
How the Measure is Calculated
(Count of households at or above the 80th percentile of income distribution - Count of households at or below the 20th of income distribution) / Total households for which income is reported