The quality or state of being popular; especially, the state of being esteemed by, or of being in favor with, the people at large; good will or favor proceeding from the people; as, the popularity of a law, statesman, or a book.

What's the noun of popular?

the quality or fact of being popular. the favor of the general public or of a particular group of people: His popularity with television audiences is unrivaled.

Is popularity a countable noun?

The noun popularity can be countable or uncountable. In more general, commonly used, contexts, the plural form will also be popularity. However, in more specific contexts, the plural form can also be popularities e.g. in reference to various types of popularities or a collection of popularities.