Population is a game mechanic with which you level up your cities. Underneath each city is a bar with a segments, the number of segments indicates how much population you need to level the city up. Your current progress is indicated in the blue segments. The dots within the segments, however, indicate how many units that city is currently supporting. You cannot have more units than segments.

Population, in game terms, determines the number of inhabitants of a city. Increasing the total population of cities is essential in establishing a strong economic backbone for your empire and to build a proper army for both offensive and defensive operations.

To gain more population for a city a number of things can be done:

Action Population Growth Stars spent Growth: Stars ratio Technology needed
Harvest Fruit 1 2 0.5 Organization
Fishing 1 2 0.5 Fishing
Farm 2 5 0.4 Farming
Mine 2 5 0.4 Mining
Hunt 1 2 0.5 Hunting
Temple (Water, Mountain, Normal) 1 20 0.05 Aquatism, Free spirit and Meditation
Forest Temple 1 15 0.067 Spiritualism
Lumber Hut 1 2 0.5 Forestry
Port 2 10 0.2 Sailing
Sawmill 1 per lumber hut adjacent to the sawmill 5 varies Mathematics
Windmill 1 per farm adjacent to the windmill 5 varies Construction
Forge 2 per mine adjacent to the forge 5 varies Smithery

Population Upgrades Edit

Here are all the rewards for upgrading a city:

Once a city in your empire reaches level 5 for the first time, you will unlock the Park of Fortune monument.

Negative Population (Anti-Food) Edit

If a city ever loses population (i.e. a city disconnected from the capital, a Nature Bunny trampling a building, destroying a building) and your population bar is empty, a red-colored segment will appear in the population bar. Each red segment removes 1 star from your production. It is not possible to make less than 0 stars per turn. You can still support Units with red segments.

If your bar fills up with red dots, your production for that city will stop completely. Should you continue to lose population, the bar will begin to shrink, and you will no longer be able to support as many units.

If you were to regain the population, you would have to first remove the red segments before creating blue segments again.