Readership (noun)

1. The readers of a publication, website, or other written work.
2. The audience or number of people who read a particular publication or website.

Origin:

From the noun "reader" with the suffix -ship.

Examples:

1. The newspaper has a large readership.
2. The magazine's readership has been decreasing.
3. The website's readership has grown significantly.
4. The book's readership is mostly young adults.
5. The readership of the blog is mainly from the United States.