Population is a term used to describe the number of units that can be trained within the player's disposal. Population is often considered a major resource in the Age of Empires Series, and in Age of Empires Online, this is no exception.
The only way to increase the population is by constructing Houses or more Town Centers, which is available for every Civilization. The higher the population, the more units can be trained within the civilization.
The maximum amount of population is currently 200. In order to reach this maximum number. A player must build 24 House (or 12 Longhouse) and 4 Town Centers. Each house will provide 5 population (the Norse Longhouse will provide 10 population). Each town center will provide 20 population. This will add up to 200 population.
Having more than 24 houses (through converting or starting with foreign ones) will not change this maximum cap. However, it is possible to have more units than your maximum cap will allow. Example: converting enemy units.
Choosing Crassus advisor will allow Romans to build 4 more houses and get additional pop.
Buildings that affect population limit[]
 |  |  |
| House | Longhouse | Town Center |
Units that can affect population over the 200 cap[]
 |  |  |  |  |  |
| Priest (Greek) | Priest of Ptah | Magus | Augur | Priest (Babylonian) | Seer |
 |  |
| Rhapsode | Pontifex |