(CNN) More than four-in-five adults report they will definitely or probably participate in the 2020 Census, according to a new survey from the Pew Research Center. But there are a few demographic groups -- mainly young people and minorities -- who are hesitant to take part.

In the last year, President Donald Trump and his administration have discussed adding a question to the census that would ask about respondents' citizenship status, only to be shut down by the Supreme Court. Groups that could be threatened by the government's knowledge of their citizenship status have previously expressed anxiety over the question being asked, and many say the damage was done even though the question won't appear, as those groups will refrain from taking it anyways.

Overall, 84% of adults said they will definitely or probably participate and 16% said they might or might not, probably will not, or definitely will not, according to the Pew survey.

Pew noted that despite the reported percentage who said they'll participate, Census Bureau research has found the response rate is usually lower than the percent who report that they plan to.

A third of young Americans said they might or might not, probably will not, or definitely will not participate in the 2020 census, the largest portion of a demographic group to express intention to not respond. They were followed by black adults (26% won't participate), those who earn under $30,000 a year (24%), and Hispanics (21%).

Read More