population
US /ˌpɑː.pjəˈleɪ.ʃən/
UK /ˌpɑː.pjəˈleɪ.ʃən/

1.
all the inhabitants of a particular town, area, or country
:
•
The city's population has grown rapidly in the last decade.
•
The global population is expected to reach 9.7 billion by 2050.