From Pew Research:
The audio news sector in the United States is split by modes of delivery: traditional terrestrial (AM/FM) radio and digital formats such as online radio and podcasting. While terrestrial radio reaches almost the entire U.S. population and remains steady in its revenue, online radio and podcasting audiences have continued to grow over the past decade.
The average weekly unique users who download NPR podcasts, which include some of the most popular podcasts in the iTunes library such as Up First and Planet Money, rose from 3.5 million in 2016 to 5.4 million in 2017, according to NPR data from Splunk.
The percentage of podcast listeners in America has also substantially increased over the past decade. In 2018, 44% of Americans ages 12 and older have ever listened to a podcast, according to Edison Research and Triton Digital survey data, and 26% have listened to a podcast in the past month, up from just 9% in 2008.
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See Also: More Fact Sheets in the State of the News Media Series (via Pew Research)