Senses
人口 population
The total number of people living in a specific area; the inhabitants of a country or city.
人口 family size
The number of people or members in a household; the number of mouths to feed in a family.
人口 people
Human beings in general; persons, often used in contexts like human trafficking or labor statistics
人口 mouths of people
(Literary) the mouths of the public, referring to popular talk or praise, notably in the idiom 脍炙人口