This statistic shows the U.S. adult population from 1971 to 2015 by income tier. In 2015, about 121 million adult U.S. 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.
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Pew Research Center. (December 9, 2015). U.S. adult population from 1971 to 2015. by income tier [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 28, 2026, from /statistics/500224/us-adult-population-by-income-tier/
Pew Research Center. "U.S. adult population from 1971 to 2015. by income tier." Chart. December 9, 2015. ÌÇÐÄÆƽâ°æ. Accessed July 28, 2026. /statistics/500224/us-adult-population-by-income-tier/
Pew Research Center. (2015). U.S. adult population from 1971 to 2015. by income tier. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 28, 2026. /statistics/500224/us-adult-population-by-income-tier/
Pew Research Center. "U.S. Adult Population from 1971 to 2015. by Income Tier." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 9 Dec 2015, /statistics/500224/us-adult-population-by-income-tier/
Pew Research Center, U.S. adult population from 1971 to 2015. by income tier ÌÇÐÄÆƽâ°æ, /statistics/500224/us-adult-population-by-income-tier/ (last visited July 28, 2026)
U.S. adult population from 1971 to 2015. by income tier [Graph], Pew Research Center, December 9, 2015. [Online]. Available: /statistics/500224/us-adult-population-by-income-tier/
