As the 2020 U.S. census approaches, Americans overwhelmingly are aware of it, and more than eight-in-ten (84 percent) say they definitely or probably will participate, a new Pew Research Center survey finds. Still, 16 percent express at least some uncertainty about responding, with higher shares saying this among some demographic groups.

Black and Hispanic adults, as well as those with lower income levels, are more likely to say they probably or definitely will not participate in the census, or that they might or might not. Black and Hispanic adults have been undercounted in the past, while lower-income adults are classified as a “hard to count” population, according to Census Bureau research.

Age is also an important predictor of whether people say they may participate, even after controlling for other factors. Young adults—those ages 18 to 29—are least likely to be on board of the four age groups included in this analysis.

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