Population
From Frostpunk 2 Wiki and Guides
Population counts the number of humans in the city. Population increases 
Heatstamp income, and increases the membership of the city's communities that Demand the resources 
Shelter, 
Food, and 
Goods.
A proportion of the population is counted as 
Workforce, typically 60% to start. If members of the population are sick with 
Disease, this can reduce the actual number of workers available.
The population grows in batches that are produced at a steady rate over time. The rate can be increased by passing immigration or relationship (eg mandatory marriage) laws at the Council. Population growth may be slowed by the Problems of 
Squalor or 
Crime.