IPA: /ˈpɒpjʊləsnəs/
KK: /ˈpɑp.jə.ləs.nəs/
The state of having a large number of people living in a particular area.
The populousness of the city has led to increased demand for housing.
Populousness → It is formed from "populus" (meaning people) and the suffix "-ness" (meaning the state or quality of). The word "populousness" refers to the state of being full of people or having a large population.
Think of 'populus' which means people, and remember that 'populousness' describes the quality of being full of people.