Share of U.S. adult population 1971-2015, by income tier

This statistic shows the percentage distribution of the U.S. adult population from 1971 to 2015, by income tier. In 2015, about 50 percent of U.S. adult residents were part of the middle class.
This study defined middle class income households as those with an income between 67 and 200 percent of the U.S. median household income, after adjustment for household size. Middle class income ranges from about 42,000 U.S. dollars to about 126,000 U.S. dollars per year for a three-person household.

Percentage of U.S. adult population from 1971 to 2015, by income tier

Lowest incomeLower middle incomeMiddle incomeUpper middle incomeHighest income
201520950129
201120951128
200118954117
199118956125
198117959123
197116961104
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Sources

Release date

December 2015

Region

United States

Survey time period

1971 to 2015

Age group

18 years and older

Supplementary notes

Income Thresholds:
Lowest income class: Less than 31,402 U.S. dollars
Lower middle income class: 31,402 - 41,868 U.S. dollars
Middle income class: 41,869 - 125,608 U.S. dollars
Upper middle income class: 125,609 - 188,412 U.S. dollars
Upper income class: More than 188,412 U.S. dollars.
The income refers to annual household income for a three-person household.

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