The phrase "a listenership of" is correct and usable in written English.
It can be used when referring to the audience or group of listeners that engage with a particular media outlet, such as a podcast, radio show, or other audio content.
Example: "The podcast has developed a listenership of over 10,000 dedicated fans who tune in every week."
Alternatives: "an audience of" or "a following of".
Limbaugh and Hannity remain the highest-rated talk radio hosts in the US, with Limbaugh regularly claiming a listenership of 15 million.
WLIB management said it did not have figures for individual shows, but the mostly talk radio station has a listenership of 280,300 for people 12 and older.
According to his management, the singer's catalog has garnered over 20 million global streams on Apple Music and 12 million streams on Spotify, with a listenership of over 740,000 per month.
His jewel, The Tom Joyner Morning Show, airs weekdays in more than 100 markets and reaches a listenership of over 8 million -- approximately one in four African Americans.
All India Radio Gorakhpur was commissioned in 1972 and currently covers 10 eastern districts of the state of Uttar Pradesh with a listenership of over 10 million people.
Judging from Tuesday's audience at Alice Tully Hall, attentive and of healthy size, there is a listenership out there more enterprising than timid concert planners have been prone to believe.
This helps explain how, in the early weeks of the race for the 2020 Democratic nomination, "Political Party Live," a two-year-old podcast produced by a group of young Iowans, with an average listenership of just a few hundred people, found itself hosting Presidential contenders.
I could be a D.J. again, programming sets for a devoted listenership of one.
For many people, Christmas begins on Christmas Eve when a single clear-voiced treble from the Choir of King's College, Cambridge, sings the first verse of "Once in Royal David's City", a heart-wrenching moment, audible via the BBC World Service to a potential listenership of 40 million.
So why is it then, that when the UK's most popular commercial sports radio station (with a claimed listenership of over eight million, nearly all of them football fans) gives a platform to nationalist bigots, quasi-fascists and racists of every strain, nobody blinks an eye?
"I remember once having a record listenership of seven".
