"The survey by the Pew Internet and American Life Project found 12% of US people online had downloaded a podcast.
Earlier this year, a survey by the same research group found that just 7% of online Americans had downloaded a show.
But despite the growth, just 1% of respondents said that they would download a podcast on a typical day.
This figure remains unchanged from the February survey.
"While podcast downloading is still an emerging activity primarily enjoyed by early adopters, the range of content now available speaks to both mainstream and niche audiences," said Mary Madden, senior research specialist at Pew.
"We are at a crossroads of a major transition in the way media content is delivered and consumed."
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