The Pew Research Center asked Americans if they had visited a public library or bookmobile in the past year. Just over half of 18-to-35-year-olds said they'd been at least once.
That's compared with 45 percent of Gen Xers and 43 percent of baby boomers.
Although many millennials attend college, the survey focused on public libraries, not on-campus academic libraries.
Tech improvements, like 3-D printers and internet, are likely helping pull more young people in. Separate research found borrowing print books and reading are still the main draws.
Although millennials might be more likely to visit public libraries, that doesn't mean they find them as useful as older generations do.
In another Pew study, Americans under 25 said if their library closed, it would have less of a community impact than older adults thought it would.