U.S. family income distribution 1990-2018, by Gini coefficient

This statistic shows the Gini coefficient, an index for measuring income distribution, for U.S. families from 1990 to 2018. A Gini coefficient of 0 expresses perfect equality, where all would have the same income,a Gini coefficient of 1 expresses maximal inequality among values. In 2018, the Gini coefficient for family income was 0.45. This is an increase since 1990, when the Gini coefficient was at of 0.4 points, indicating an increase of income inequality in the United States.

U.S. family income distribution from 1990 to 2018

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Release date

August 2019


United States

Survey time period

1990 to 2018

Supplementary notes

* The Gini coefficient measures the inequality among values of a frequency distribution (for example levels of income). A Gini coefficient of zero expresses perfect equality where all values are the same (for example, where everyone has an exactly equal income). A Gini coefficient of one (100 on the percentile scale) expresses maximal inequality among values (for example where only one person has all the income).
Data have been rounded to provide better understanding of the statistic.

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Statistics on "Poverty and Income in the United States"

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